937Detection Systems

937.1General Description

Furnish, install, test, and provide warranty and training for detection systems comprised of equipment and materials as specified herein and shown in the Contract. For traffic signal and ramp meter applications, follow Section 647 for submittal requirements, construction procedures, maintenance guidelines, warranty, acceptance, and training requirements. For ITS and continuous count station applications, follow Section 942 for submittal requirements, construction procedures, maintenance guidelines, warranty, testing, acceptance, and training requirements. Verify the firmware and software furnished and installed as part of any detection system is the most current and approved releases or versions, unless otherwise requested by the Department. 937.1.01 Definitions, Acronyms, and Abbreviations

provide detector output (contact closure) to the controller through an edge card connector.

electric current to a coil of wire embedded in the travel lane, which measures changes in the inductance (magnetic field) when vehicles pass over the coil of wire.

during multiple lane relocations that may occur during construction phases. A vehicle detection system can be repositioned and/or the detection zones can be redefined to support the maintenance of traffic. When identified as a project pay item, the maintenance of detection shall begin when existing detectors or detection system is rendered inoperable by construction activities until final acceptance. For projects installing new traffic signals, actuation shall be fully operable at the time of signal activation.

vehicle presence, volumes, occupancy and speed.

traffic control device controller.

traffic signal controller.

pushbuttons, and pedestrian actuation signs designed to provide a pushbutton with a raised, vibrating tactile arrow and audible indications for differing pedestrian signal functions. 1918

system for projects such as resurfacing projects. The contractor will be responsible for installing and removing the temporary vehicle detection system.

includes continuous count stations; the program includes data collection of vehicle classification, vehicle volume, vehicle speed, and vehicle weight.

vehicle counts, vehicle classification, detector occupancy, and/or speed information.

electromagnetic radiation normally visible to the human eye, which is typically between 380 nm and 760 nm.

processed as a thermal image (video).

in the magnetic field to detect the presence of vehicles, collect vehicle counts, roadway occupancy, vehicle classification, or speed information.

occupancy and classification.

Refer to Sections 101.01, 647.1.01.B and 942.1.01.B for a list of acronyms, abbreviations, and terminology used in this section.

937.102 Related References

Section 937 provides requirements and specifications that apply to the following sections:

1919

Standards and documents referenced throughout Section 937 are provided in Table 1. Table 1 - Referenced Documents Code of Public Transportation, State of Georgia. FCC Part 15 of Title 47 of the CFR, Subpart B, Class B. Federal Specification #W-C-596, General Specification for Electrical Power Connectors, latest edition. IEC EN 50022, Specification for Low Voltage Switchgear and Control Gear for Industrial Use. Mounting Rails. Top Hat Rails 35 mm Wide for Snap-On Mounting of Equipment. IEC EN 60715, Dimensions of low-voltage switchgear and control gear - Standardized mounting on rails for mechanical support of switchgear, control gear and accessories, latest edition. IEC EN 61000-4-5, Electromagnetic compatibility (EMC) - Part 4-5: Testing and measurement techniques - Surge immunity test, latest edition. IEC EN 61000-6-4, Electromagnetic compatibility (EMC) - Part 6-4: Generic standards - Emission standard for industrial environments, latest edition. IEEE C62.41.1, IEEE Guide on the Surge Environment in Low-Voltage (1000 V and less) AC Power Circuits. IEEE C62.41.2, IEEE Recommended Practice on Characterization of Surges in Low-Voltage (1000 V and less) AC Power Circuits. IEEE C62.45, IEEE Recommended Practice on Surge Testing for Equipment Connected to Low-Voltage (1000 V and less) AC Power Circuits. Insulated Cable Engineers Association, 600 Volt Rated Cables Standard, latest edition. Joint AASHTO/ITE/NEMA Committee on the ATC, Intelligent Transportation System (ITS) Standard Specification for Roadside Cabinets (v01.02.17b), latest edition. MIL-HDBK-217F, Military Handbook: Reliability Prediction of Electronic Equipment, latest edition. MIL-STD-810F (Notice 3), Department of Defense Test Method Standard: Environmental Engineering Considerations and Laboratory Tests, latest edition. Manual on Uniform Traffic Control Devices, Federal Highway Administration, latest edition. National Institute of Standards and Technology, Handbook 44-2020. NEMA 250, Enclosures for Electrical Equipment (1000 Volts Maximum), latest edition. NEMA AB-1, Molded-Case Circuit Breakers, Molded Case Switches, and Circuit-Breaker Enclosures, latest edition. NEMA TS 2, Traffic Controller Assemblies with NTCIP Requirements—Version 03.07, latest edition. NFPA 70, National Electrical Code, latest edition. Scale Manufacturer’s Association, Standard for Vehicle Scale Characterization (SMA VCS-1102). SMPTE 274M, 1920 x 1080 Image Sample Structure, latest edition. SMPTE 296M, 1280 × 720 Progressive Image Sample Structure, latest edition. Telcordia SR-332, Reliability Prediction Procedure for Electronic Equipment, latest edition. TIA RS-250C, Electrical Performance Standards, latest edition. TIA-310-D, 19-in Rack Mount Specification, latest edition. TIA-568-C.2, Balanced Twisted-Pair Telecommunications Cabling and Components Standards, latest edition. Traffic Monitoring Guide, Federal Highway Administration, 2016. UL 1059, Standard for Terminal Blocks, latest edition. UL 1283, Standard for Electromagnetic Interference Filters, latest edition. UL 1449, Standard for Surge Protective Devices, 4th edition. UL 1778, Uninterruptible Power Systems, latest edition. UL 444, Communications Cables, latest edition. UL 489, Molded-Case Circuit Breakers, Molded-Case Switches, and Circuit-Breaker Enclosures, latest edition. 1920

937.1.03 Submittals For ITS and continuous count station applications, follow Section 942 for submittal requirements. For traffic signal and ramp meter applications, follow Section 647 for submittal requirements. 937.1.04 System Requirements

installation of equipment. The drawings shall be provided with the project documentation to the Department.

intrusive system actuation zone and delivery of a contact closure or SDLC data input to the controller. ii. Pulse Mode: The actuation starts with the arrival of the vehicle to the detection zone and ends after a fixed duration contact closure. iii. Presence Mode: The actuation starts with the arrival of the vehicle to the detection zone and ends when the vehicle leaves the detection zone.

ii. Occupancy: time that a detector held a presence call as a percentage of the total time within a user- selected period of time. iii. Speed: calculated average value of vehicle velocity that crossed a detector within a user-selected period of time.

by the Traffic Monitoring Guide, FHWA, Appendix C. ii. Vehicle Volume: number of vehicles crossing a detector within a user-selected period of time. iii. Vehicle Speed: calculated average value of vehicle velocity that crossed a detector within a user- selected period of time. iv. Gross Weight: the total vehicle weight as derived from the measured sum of all tire loads of a single vehicle.

that uses pre-emption to obtain pre-emption output and route output cable to the signal controller operating the intersection to be pre-empted.

1921

Table 2 – Minimum Accuracy Requirements for Traffic Signal and Ramp Meter Applications

Application Accuracy

Pedestrian Detection (Pushbutton) 100%

Stop Bar Detection

Detection Zone Range: 6 ft. x 20 ft. (1.8 m x 6.1 m) to

6 ft. x 40 ft. (1.8 m x 12.2 m) Inductance Loops or

Equivalent

99%

Presence Mode

Stop Bar Supplemental Data, System Detection

applications

Detection Zone: 6 ft. x 6 ft. (1.8 m x 1.8 m) Inductance

Loops or Equivalent

92%

Presence or Pulse Mode

Set Back or System Detection and Data

Detection Zone: 6 ft. x 6 ft. (1.8 m x 1.8 m) Inductance

Loops or Equivalent

99%

Pulse Mode

During Amber and Red

Intervals

During Green Interval

Response Time (85 th percentile) Less than 1 second Less than 100 ms

Response Time (100 th percentile) Less than 5 seconds Less than 500 ms

False Call Duration Less than 500 ms Less than 500 ms

Number of Missed Calls Less than 1% per 24 hours Less than 4% per 24 hours

Number of False Calls Less than 3% in 24 hours

Table 4 – Minimum Accuracy Requirements for Continuous Count Station Applications

Application Accuracy

Vehicle Classification 95%

Vehicle Volume 90%

Vehicle Speed 90%

Table 3 – Minimum Vehicle Accuracy Requirements for Freeway Applications

Application Volume

Accuracy

Occupancy

Accuracy

Speed Accuracy

Detection Zone: 6 ft. x 6 ft. (1.8 m x 1.8 m)

Inductance Loops or Equivalent

90% 90% 90% 1922

following elements:

locations (urban, rural), and traffic conditions (free flowing, congested) to determine testing length and

sample size.

ii. Provide data collection site for accuracy testing, including a minimum of two intersections of

varying attributes.

iii. Perform minimum sample size calculations for accuracy testing, including a variety of external lighting

(daylight, dawn, dusk, darkness) and pavement conditions (dry and wet). Regardless of the calculated

minimum sample size, the minimum sample size is 1,000 data points for each lighting, pavement, and

temperature condition.

set back detectors or detection zones.

ii. The total number of unique actuation events, identified and tabulated as individual events, shall not

deviate from the number of actuation events by more than the minimum system accuracy

percentage. The deviation represents the total of the over-counting and the under-counting actuation

events, representing the absolute value of the deviation.

ii. The total number of unique events, identified and tabulated as individual events, shall not deviate

from the actual events by more than the minimum system accuracy percentage. The deviation

represents the total of the over-counting and the under-counting actuation events, representing the

absolute value of the deviation.

iii. Speed shall be defined as the measured velocity of each event in mph.

iv. Occupancy shall be defined as the measured amount of time each event occupied the detector or

detection zone.

defined by FHWA.

ii. The total number of unique events, identified and tabulated as individual events, shall not deviate

from the actual events by more than the minimum system accuracy percentage. The deviation

represents the total of the over-counting and the under-counting actuation events, representing the

absolute value of the deviation. 1923

ii. Axle weight: see Section 691 for accuracy requirements.

the Department’s traffic signal system platform.

ii. Freeway applications work includes devices or subsystems of the network and the Department’s

ATMS platform.

iii. Continuous count station applications work includes devices and the Department’s Traffic Monitoring

Program system platform.

or higher, auto sensing full or half-duplex operations.

ii. Provide network hardware interface including a minimum of one 10BASE-T/100BASE-TX PoE

Ethernet-port using an IP66 rated RJ-45 weathertight connector and coupler or other Ethernet-

compatible locking weathertight connector and coupler.

programmable.

remote access, collect data, and control and configure the vehicle detection system.

for inductance loops. In these cases, the IP addressing capability requirements apply.

Traffic Monitoring Program.

1924

apply.

from the system locally and remotely.

other third-party software and systems.

calibrate, operate, and view status of system features.

processors on the same network without interruptions or conflicts with the normal polling cycle.

access to device setup and settings.

weeks of binned data.

viewable roadway lanes and ramps.

passage or presence of each vehicle detected for each detection zone by changing the color or

intensity of that zone.

ii. Detection During Reconfiguration: The detection system shall be able to continue detecting vehicles

on existing zones during reconfiguration, and switch to updated zones upon saving new settings.

iii. Enable the user to define the contents of binned data that is transmitted through the network.

iv. User-selected settings for detector count periods and detector zone sensitivity.

the network for later re-loading to the video detection processor, if necessary.

integrated with the Department’s Traffic Monitoring Program platform. 1925

937.2Materials

937.2.01 General

conformance with the traffic signal controller specifications in Section 925.

controller, in conformance with the controller cabinet assembly standards in Section 925.

environmental requirements detailed in NEMA Standard Publication TS 2-2016, Section 2.

enclosure, unless specified otherwise in this section.

on 120 VAC, the converter shall be included at no cost to the Department.

937.2.02 Inductance Loop Detection System

shown in the Contract.

request.

detector card does not have an IP address.

1926

transient tests, and size requirements of:

ii. 6 ft x 20 ft (1.8 m x 6.1 m) [dipole]

iii. 6 ft x 40 ft [(1.8 m x 12.2 m) [dipole or quadrupole]

fault monitor.

power or reset signal.

power, and cause false actuations.

ii. Enable overlapped loops for directional control.

iii. Enable use of multi-conductor homerun cable connected to the same detector unit.

1927

point short to ground.

(>25% of nominal).

is rectified.

but the detect LED and output returns to normal operation.

the detector is removed.

following requirements:

the loop.

ii. Presence Mode

minimum of 60 minutes for automobiles.

motion in the sensing zone every 10 minutes.

and that the unit resumes normal operation within 4 sec after the application of power or after a reset

signal of l5 ms.

changes, special software or substitutions, modifications, or additions to the unit. 1928

F Functional Requirements

motor vehicles when connected to a 6 ft. x 6 ft. (1.8 m x 1.8 m) loop and lead-in without detecting vehicles in

adjacent lanes.

80 mph (130 kph).

loop perimeter.

937.2.03 Pedestrian Detection System

in the Contract.

and cosmetically acceptable, free of molding fins, cracks, and other exterior blemishes.

adhesion. The housing shall be finished with baked enamel finish power coating or paint in

highway yellow.

opening shall have a plug furnished.

aluminum housing.

ii. Pushbutton shall be actuated by a force of 3 lbs. (1.36 kg) or less. 1929

stations with 9 in. (229 mm) by 12 in. (305 mm).

5 in. (127 mm) by 7 in. (178 mm).

control signals, except for RRFB installations.

ii. If an audible actuation confirmation tone for button release is available, it shall be between

2.2 and 2.7 kHz.

iii. Audible actuation confirmation tones shall last a minimum of 50 ms and not exceed 150 ms.

iv. Audible actuation confirmation tones shall not exceed 75 dB at 3.3 ft. (1.0 m).

ii. Detection confirmation light shall have a viewable angle greater than 120 degrees.

iii. Detection confirmation light shall have momentary and latching options. 1930

pushbuttons, and pedestrian actuation signs designed to provide a pushbutton with a raised, vibrating

tactile arrow and audible messages and locator tone for differing pedestrian signal functions.

ii. Provide up to 16 detectors (4 maximum per channel) in a single traffic controller cabinet.

ii. All audible messages and tones shall emanate from the accessible pedestrian pushbutton housing.

iii. Accessible Pedestrian Detector shall use digital audio technology.

iv. Provide a minimum of three programmable locator tones.

the locator tone, walk, and audible beaconing features.

vi. Provide the annunciated “Wait” message once per actuation.

feature.

ii. Locator tone have a volume range of 30 to 90 dB measured at 3 ft. (0.9 m) from unit.

iii. Provide capability to deactivate the Accessible Pedestrian Detector locator tone.

weatherproof audible speaker, and pedestrian actuation sign with optional placard Braille messages.

ii. Provide tactile arrow that is 2 in. (52 mm) in length and field adjustable to two directions.

ii. Provide capability to disable the “Walk” functionality if a conflict is detected.

ii. Provide LED indicators for each channel operation.

iii. Provide capability to automatically reset upon loss of internal communication. 1931

937.2.04 Video Detection System

connection over a single weathertight connector.

including blooming caused by headlights and minor vibration caused by wind.

ii. IVDS shall enables user to select video resolution with a minimum of 720P (1280x720 lines)

video output.

to the processor for real-time vehicle actuation.

ii. IVDS shall enable user to select video resolution with a minimum of 480P (640×480 lines)

video output.

with a H.264 or H.265 option. Camera provides full color/motorized zoom focus control with auto focus

and manual focus override.

operations or to inspect the faceplate cleanliness.

shall not interfere with the video camera sensor operation or cause video signal interference. 1932

ii. IVDS processor shall support mounting and operation in an enclosed field cabinet or hub building

without blower fans and without insulation from other electronic devices such as power supplies and

communications equipment.

iii. Verify video inputs are provided on the IVDS processor such that signals from one video camera

sensor or other synchronous or non-synchronous video source can be processed in real time.

ii. Processor shall fit standard CalTrans cabinet input file and provide a standard contact closure (input)

to the controller.

iii. Provide one to four detector outputs through the processor module that communicate through the

edge card connector. Use a module that is no wider than two standard input file slots.

recommended surge suppressor to the video camera sensor.

using the edge card connector for power and to provide contact closure outputs.

spaced 8 ft. (2.4 m) apart for stop bar applications at traffic signals and ramp meters.

to a 6 ft. by 50 ft. (1.8 m by 15.2 m) for stop bar applications at traffic signals and ramp meters.

1933

weeks of binned data.

device and centralized video system.

application as shown in the Contract.

with no gap in data.

temperature effects, wind shifting, pole sway, pole expansion, or vibration.

937.2.05 Microwave Vehicle Detection System Requirements

interface to the MVDS unit.

or commonly shielded. 1934

field cabinet.

(rise time = 1.2 μs, hold = 50 μs) applied in differential mode to lines, power, and output as defined by IEC

1000-4-5 and EN 61000-4-5 standards or NEMA TS2-2003, 300V Transient Voltage Protection.

manufacturer’s recommendations.

10 to 600 sec.

ii. Data shall be available simultaneously with detection zone contact closures and network

communications. Supply modules as necessary for simultaneous communications.

iii. Vehicle classification by length in a minimum of three user defined classes. Supplemental detection

zones, not used for vehicle actuation, may be used to collect this data.

iv. Enable the user to define the contents of transmitted data.

determined by the manufacturer.

single direction.

direction and a minimum of sixteen detection zones (lanes) for bi-directional travel:

ii. Lane occupancy

iii. Average speed 1935

that meet the specifications of the controller.

ideal mounting height can detect at a minimum distance of 100 ft. (30.5 m).

weeks of binned data.

non-volatile memory.

computers on the network.

in repeaters.

detectors overlaying a representation of the roadway.

performed over the network to re-load to the processor, if necessary.

as lane -shifts, new construction, or closures.

937.2.06 Wireless Magnetometer Detection System Requirements

and comply with IEC IP67 standards, including radio and repeater components.

(Section 2.1.12), or approved equivalent.

(Section 2.1.13), or approved equivalent. 1936

single WMDS unit harness cable with a military-style connector.

data interface to the WMDS unit.

manufacturer prior to installation and on-site cable pulling.

shielded pair in accordance with the manufacturer’s recommendations.

or commonly shielded.

the WMDS communications wiring module in the controller or field cabinet. Alternative power sources and

adapters shall be submitted to and approved by the Department.

(rise time = 1.2 μs, hold = 50 μs) applied in differential mode to lines, power, and output as defined by IEC

1000-4-5 and EN 61000-4-5 standards or NEMA TS2-2003, 300V Transient Voltage Protection.

manufacturer’s recommendations.

1937

with in-pavement sensors and wired connections to associated systems.

time clock.

not require specialized tools for installation.

the elements.

support a minimum of 12 sensors.

interface to provide:

ii. Delay timing.

iii. Extension timing.

1938

equipment and shall not interfere with known equipment.

connectors per manufacturer’s specification.

manufacturer and as approved by the Department.

industry standard.

weeks of binned data.

volume, occupancy, speed, and classification data over the Department’s network.

zone of a standard 6 ft. by 6 ft. (1.8 by 1.8 m) inductance loop.

the system is capable of detecting a motorcycle and a light rail vehicle.

several interfaces.

an unlicensed frequency band.

interference with other devices operating in the unlicensed band.

1939

937.2.07 Continuous Count Station System

shown in the Contract.

the QPL.

IEC 68-2-30 (test Fc), NEMA TS-1 (Section 2.1.12), or approved equivalent.

68-2-27 (test a), NEMA TS-1 (Section 2.1.13), or approved equivalent.

Department’s current cellular telecommunications service provider.

occupies the cabinet, including consideration for system maintenance.

the Department. 1940

accuracy requirements.

937.2.08 Temporary Vehicle Detection System

Furnish a Temporary Vehicle Detection System that meets the requirements of this Section.

937.2.09 Maintenance of Vehicle Detection System

Furnish a Maintenance of Vehicle Detection System, if different than the final vehicle detection system specified in the

Contract, that meet the requirements of this Section.

937.3Construction

For ITS and continuous count station devices, additional construction requirements are referenced in Section 942.

937.3.01 General

assigning channels and sensors to repeaters and access points.

installation, and supply all drawings showing the recordings as part of the as-builts at the end of the project.

1941

937.3.02 Inductance Loop Detection System

are allowed.

Contract.

such as a manhole cover, water valves, grates, metal gates, etc.

roadway and placing sealant into saw cuts.

in one direction and connect to the controller or field cabinet input panel to the appropriate detector channel

on all odd-numbered terminals.

Table 6 – Wiring Standards for Traffic Control Signal Inductance Loop Detectors

Detectors Phases 3, 4, 7, and 8 Stop Bar

Loops

Phases 2 and 6 Setback Loops and

Phases 1 and 5 Stop Bar Loops

Wire Color Shielded Loop Lead-

in Cable, 3 Pair

Wire

Color

Shielded Loop Lead-in

Cable, 3 Pair

First Left-Turn Lane from Curb Red Red/Black Pair (1)

Second Left-Turn Lane Green Green/Black Pair (1)

Third Left-Turn Lane White White/Black Pair (1)

Right Curb Lane Red Red/Black Pair (1) Red Red/Black Pair (2)

Second Lane Green Green/Black Pair (1) Green Green/Black Pair (2)

Third Lane White White/Black Pair (1) White White/Black Pair (2)

Fourth Lane Red Red/Black Pair (2) Red Red/Black Pair (3)

Fifth Lane Green Green/Black Pair (2) Green Green/Black Pair (3)

Sixth Lane White White/Black Pair (2) White White/Black Pair (3)

Note: (n) - Number of three-pair shielded cables 1942

side of the road and its own drilled hole through the curb.

depth to the top of the wire.

XHHW-2, and a minimum of 0.31 in. (8 mm) wide for polyethylene or PVC-encased No. 14 AWG loop wire.

directed by the Department.

Do not make a full triangle cut. Depth shall be uniform.

Table 7 – Wiring Standards for Ramp Meter Inductance Loop Detectors

End - Queue Detector Loops Mid - Queue Detector Loops

Wire Color Shielded Loop Lead-in Cable, 3

Pair

Wire Color Shielded Loop Lead-in Cable, 3

Pair

Lane 1 Red Red/Black Pair (1) Red Red/Black Pair (2)

Lane 2 Green Green/Black Pair (1) Green Green/Black Pair (2)

Lane 3 White White/Black Pair (1) White White/Black Pair (2)

Demand Detector Loops Passage Detector Loops

Wire Color Shielded Loop Lead-in Cable, 3

Pair

Wire Color Shielded Loop Lead-in Cable, 3

Pair

Lane 1 Red Red/Black Pair (3) Red Red/Black Pair (4)

Lane 2 Green Green/Black Pair (3) Green Green/Black Pair (4)

Lane 3 White White/Black Pair (3) White White/Black Pair (4)

Freeway Mainline Detector Loops (if used) Exit Ramp Detector Loops (if used)

Wire Color Shielded Loop Lead-in Cable, 3

Pair

Wire Color Shielded Loop Lead-in Cable, 3

Pair

Lane 1 Red Red/Black Pair (5) Red Red/Black Pair (6)

Lane 2 Green Green/Black Pair (5) Green Green/Black Pair (6)

Lane 3 White White/Black Pair (5) White White/Black Pair (6)

Number of three-pair shielded cables (n)

Note: Lane numbering shall begin at the median for mainline travel lanes. Lane numbering for ramp meter lanes shall

begin with the lane adjacent to the mainline travel lanes. 1943

the slot to guarantee adhesion of the loop sealant. Use compressed air to thoroughly clean out and dry

the sawed slot with a minimum of 125 psi (8.8 kg/cm

). Handheld or backpack blowers shall only be used

to dry the pavement or remove debris away from the saw cut edge.

the specified number of turns, and back to the pull box or conduit.

backer rod as approved by the Department.

encases the wire to prevent moisture from entering the tube.

the Standard Detail Drawings. When crossing expansion joints, drill a 2 in. (50 mm) diameter hole a minimum

4 in. (100 mm) deep or to bottom of saw cut. Do not install loop wires in an expansion joint.

cabinet. When possible, start the twist of loop wires from the loop’s edge in the saw cut to the loop lead-in

cable splice, or directly to the cabinet.

loop sealant mixture that requires a caulk gun or similar device. See Section 833.2.09.

pavement surface.

epoxy sealants before the sealant sets.

dust the sealer on the pavement surface with cement dust before opening the roadway to traffic.

specifications and local, state, and federal regulations. 1944

or conduit to the controller or field cabinet input panel, unless otherwise specified in the Contract.

cabinet input panel. The 3-pair cable shall not be spliced.

present. If voltage is present, then the shield in the loop lead-in cable shall be bonded to controller cabinet

equipment bus bar per NEC.

amplifier unit, wire them in series to their loop lead-in at the pull box or conduit.

range for the detector amplifier unit.

the pull box.

specifications:

under live traffic conditions. See standard detail drawings for splicing details.

to commencing loop construction activities at the intersection.

operational loop prior to beginning work will be considered as extra work.

not to cut existing loop lead-ins and loop wires that are to be retained.

notify the Engineer and complete the replacement of the damaged loops immediately.

replaced and returned to full operation.

of the Contractor. 1945

as needed.

1946

Table 8 – Loop Installation Data Sheet

Location

Intersection Major Route District

Intersection Minor Route City

Intersection (MaxTime) Number County

Date: PI Number

Contractor: Installation/Plan Sheet Number

Weather: Pavement Condition - Wet ( ) or Dry ( ) Temperature:

Intersection Sketch North

Loop #1

Phase: Function:

Size and Type of Loop: Lane Location:

No. of Turns: Downstream/Upstream: Down ( ) Up ( )

Loop Wire Color/Insulation Type/Gauge: Sealant Manufacturer and Lot No.:

Sealant Type and Part Number: Distance E.O.P/Curb to Lead-in:

Distance from Stop Bar: Splice Point:

Loop Lead-In Wire Color/Insulation Type/Gauge: Distance Lead-in Cable:

Conduit Length Curb/E.O.P. to Splice Point: Conduit Length Splice Point to Cabinet:

Sealant Manufacturer and Lot No.:

Comments 1947

the pavement:

an analog meter.

value. See Table 9 for wire resistance values.

Table 9 – Loop Wire Resistance

Wire Gauge Acceptable Resistance DC at 68 °F [20 °C] (+/- 10%)

18 AWG Approximately 5.5 ohms per 1,000 ft.

R = 29.4 μ/mile (or) R = 5.5 x 10-3 μ/ft (R = 18.3 μ/km (or) R=18.3 x 10-3 μ/m)

14 AWG Approximately 2.52 ohms per 1,000 ft.

R = 13.32 μ/mile (or) R = 2.523 x 10-3 μ/ft (R = 8.3 μ/km (or) R=8.3 x 10-3 μ/m)

12 AWG Approximately 0.98 ohms per 1,000 ft.

R = 5.2 μ/mile (or) R = 9.85 x 10-4 μ/ft (R = 3.24 μ/km (or) R = 3.24 x 10-3 μ/m)

Note: Loop Q at 50 kHz shall be greater than 5.

inductance of loop plus inductance of the loop lead-in. Acceptable inductance is within 10% of the

calculated value for a single loop with the design criteria listed in Tables 10 and 11.

Table 10 – Dipole Loop Wire Inductance

6 ft. x 6 ft. (3 turns) [1.8 m x 1.8 m] I = 76 mH + 23 mH per 100 ft (30 m) lead-in cable

6 ft. x 30 ft. (2 turns) [1.8 m x 9 m] I = 126 mH + 23 mH per 100 ft (30 m) lead-in cable

6 ft. x 40 ft. (2 turns) [1.8 m x 12 m] I = 165 mH + 23 mH per 100 ft (30 m) lead-in cable

6 ft. x 50 ft. (2 turns) [1.8 m x 15 m] I = 205 mH + 23 mH per 100 ft (30 m) lead-in cable

6 ft. x 70 ft. (2 turns) [1.8 m x 21 m] I = 285 mH + 23 mH per 100 ft (30 m) lead-in cable

Table 11 – Quadrupole Loop Inductance

6 ft. x 30 ft. (2, 4, 2 turns) [1.8 m x 9 m] I = 269 mH + 23 mH per 100 ft (30 m) lead-in cable

6 ft. x 40 ft. (2, 4, 2 turns) [1.8 m x 12 m] I = 349 mH + 23 mH per 100 ft (30 m) lead-in cable

6 ft. x 50 ft. (2, 4, 2 turns) [1.8 m x 15 m] I = 429 mH + 23 mH per 100 ft (30 m) lead-in cable

6 ft. x 60 ft. (2, 4, 2 turns) [1.8 m x 18 m] I = 509 mH + 23 mH per 100 ft (30 m) lead-in cable

6 ft. x 70 ft. (2, 4, 2 turns) [1.8 m x 21 m] I = 589 mH + 23 mH per 100 ft (30 m) lead-in cable

and install new wire. Repeat the test procedure.

10 kW or greater)

1948

test is found unacceptable, remove the loop, install new wire, and repeat the test procedure.

R x 10 KW or greater)

ii. The last calibration date of the equipment and the scale used

Ensure that the completed units detect all motor vehicles. If the loop detection system does not meet the

above test requirements, payment will not be made for work on the signal installation until corrections are

completed.

937.3.03 Pedestrian Detection System (All Types)

according to the Contract.

pedestrian pushbutton station(s) location to operate either one or two pushbuttons.

shall be made.

Table 12 – Wiring Standards for Pedestrian Pushbuttons

3-Pair Shielded Cable

Phase 2 and 6 Phase 4 and 8

2 Wire Pushbutton Green and Black Pair Red and Black Pair

3-Wire Pushbutton* Green and Black Pair plus White Red and Black Pair plus White

*Each 3-wire button will require a dedicated 3-pair shielded cable. 1949

937.3.04 Video Detection System

equipment at the locations specified in the Contract and per manufacturer recommendations to provide

optimum actuation accuracy.

modules within the input files, or at a location designated by the Department.

recommendation for system acceptance testing.

between adjacent equipment in the freeway controller or field cabinet.

specifications, and as specified in the Contract.

other system components and be fully protected from all surge potential.

terminated and corrosion resistant and weathertight.

the video camera sensor and processor, except for surge protection connections between sensor and

cabinet, so that both the camera and processor are protected.

diagrams of the cabinet and IVDS documents.

or field cabinet.

conductors to terminal blocks in the controller or field cabinet.

manufacturer’s recommendations and NEC.

associated hardware and materials. 1950

unless otherwise specified in the Contract:

of the approach or lanes.

pipe by threading onto the pipe or as a slip-fit, using a set-screw fastener in either above method.

bolts. Use aircraft-grade galvanized steel cables with stainless steel fastening hardware and that make a

minimum of two wraps around the mast arm. Do not use banding straps.

and buss bar breakers according to function. Labels shall be weather and wear resistant.

devices as specified in this section and UL 1449.

the video signal coaxial feed on terminal strips.

sensor from ground rise potential (i.e., surge up to the video camera sensor).

field cabinet:

the controller or field cabinet.

hex-head or Phillips-head machine screws.

buss bars, panel and socket mounted surge protection devices, accessory and equipment outlets, and DC

power supply chassis. 1951

locking washer or insert) or into tapped and threaded holes.

assembly, and any component shall be removable without requiring removal of other components, panels, or

mounting rails.

cabinet as shown in the Contract and Standard Detail Drawings.

rack as shown in the details.

be hinged open a minimum of 90º without binding or stressing any coaxial cable.

Used as a prefix, it identifies the individual IVDS components used for signal and freeway ramp metering as

follows for “nnn” direction of traffic flow, type of detection, and lane assignment:

processor module or detector panel.

on the network.

1952

Contract.

with the manufacturers’ recommendations.

appropriate interval. Perform the test from the hub building where the detection system is connected.

937.3.05 Microwave Vehicle Detection System

mounting height varies from the information provided in the Contract.

system components.

recommendations and NEC requirements.

Connections shall be watertight.

to the detector cable.

the detector unit to the terminal blocks.

item and terminal position numbered and named by function with weather and wear resistant labels.

hex-head or Phillips-head machine screws.

servers, Ethernet switches, circuit breakers, and accessory and equipment outlets. 1953

mounting nuts.

Removing any component shall not require removing other components, panels, or mounting rails.

on the network.

the Contract.

comply with the manufacturers’ recommendations.

data at the appropriate interval. Perform the test from the hub building where the detection system

is connected.

the network.

937.3.06 Wireless Magnetometer Detection System

magnetic noise such as underground power cables, overhead high-tension power cables, light rail or subway

tracks, electronic gates, power generation stations, and sub-stations.

Table 13 – Wireless Vehicle Detection Sensor Spacing

Speed >25 mph 25 < 45 mph < 45 mph

Sensor spacing 10 ft (3 m) 10 to 12 ft (3 to 3.6 m) 20 to 24 ft (6.1 – 7.3 m) 1954

connections may be used.

requirements are followed.

the lip of the hole.

in the roadway and repeater or access point are followed, with a clear line-of-sight.

access point distances and housing directions are followed.

on the network.

the Contract.

comply with the manufacturers’ recommendations.

specified data at the appropriate interval. Perform the test from the hub building where the detection

system is connected.

the network. 1955

937.3.07 Continuous Count Station System

recommendations and NEC requirements.

the network.

the Contract.

manufacturers’ recommendations.

appropriate interval.

the network.

937.3.08 Temporary Vehicle Detection System

detection system.

construction projects such as resurfacing projects, where vehicle detection is temporarily interrupted

by construction activities.

1956

functioning system.

each phase of construction until the final configuration is constructed.

937.3.09 Maintenance of Vehicle Detection System

construction, and the maintenance of traffic plans will apply to the maintenance of vehicle detection system.

detection system during multiple phases of construction.

of vehicle detection system equipment shall meet the requirements of this Section.

construction phase at the time of signal activation.

implemented with the Construction Manager.

adjustments are necessary to meet field conditions, the field adjustments shall be approved by the

Construction Manager.

configuration is constructed.

require resetting traffic detection zones.

937.4Measurement

A vehicle detection system, accepted by the Department after a successful 30-day burn-in period, is paid for at the

Contract unit price. Payment is full compensation for the labor, materials, equipment, tools, test equipment,

incidentals, installation, testing, and providing warranty necessary for the vehicle detection system technology.

937.4.01 Inductance Loop Detection System

Inductance Loop Detection System for traffic signal or ramp meter projects is measured as lump sum per location

(traffic signal or ramp meter) installed, completed, functional, and accepted. Unless otherwise specified in the

Contract, furnish, install, and test all components to detect vehicles as shown for a traffic signal or ramp meter. 1957

937.4.02 Pedestrian Detection System

Pedestrian Detection System is measured as lump sum per location installed, completed, functional, and accepted.

Unless otherwise specified in the Contract, furnish, install, and test all components to detect pedestrians.

937.4.03 Video Detection System

Video Detection System is measured as lump sum per location (traffic signal or ramp meter) installed, completed,

functional, and accepted. Unless otherwise specified in the Contract, furnish, install, and test all components to detect

vehicles as shown for a traffic signal or ramp meter.

937.4.04 Microwave Vehicle Detection System

Microwave Radar Detection System is measured as lump sum per location (traffic signal or ramp meter) installed,

completed, functional, and accepted. Unless otherwise specified in the Contract, furnish, install, and test all

components to detect vehicles as shown for a traffic signal or ramp meter.

937.4.05 Wireless Magnetometer Detection System

Wireless Magnetometer Detection System is measured as lump sum per location (traffic signal or ramp meter)

installed, completed, functional, and accepted. Unless otherwise specified in the Contract, furnish, install, and test all

components to detect vehicles as shown for a traffic signal or ramp meter.

937.4.06 Continuous Count Station System

Continuous Count Station System is measured as lump sum per location installed, completed, functional, and

accepted. Unless otherwise specified in the Contract, furnish, install, and test all components to detect vehicles as

shown for a continuous count station.

937.4.07 Continuous Count Station System, Weigh-in-Motion

Continuous Count Station System, Weigh-in-Motion is measured as lump sum per location installed, completed,

functional, and accepted. Unless otherwise specified in the Contract, furnish, install, and test all components to detect

vehicles as shown for a continuous count station that includes weigh-in-motion.

937.4.08 Temporary Vehicle Detection System

Temporary Vehicle Detection System is measured as lump sum per location (traffic signal or ramp meter) for the

Contractor to install, configure, and remove a temporary vehicle actuation during construction. Payment shall be

divided into equal payments based on the number of maintenance of traffic phases presented in the Contract. The

final vehicle detectors or detection zone configuration shall be included in the work associated with Section 937.3,

as appropriate. 1958

937.4.09 Maintenance of Vehicle Detection System

Maintenance of Vehicle Detection System is measured as lump sum per location (traffic signal or ramp meter) installed

using the Maintenance of Vehicle Detection System pay item. Payment shall be divided into equal payments based on

the number of maintenance of traffic phases presented in the Contract. Final configuration of the vehicle detection

system shall be part of Section 937.3, as appropriate.

Training; Detection System

Training will be measured as a lump sum for supplies, equipment, materials, handouts, travel, and subsistence

necessary to conduct the training.

937.5Payment

937.5.01 General

Payment is full compensation for furnishing and installing a detection system. This price will include full compensation

for labor, materials, equipment, tools, test equipment, incidentals, installation, testing, and providing warranty

necessary to complete the work as described in this section. The total sum of all payments cannot exceed the original

Contract amount for this item.

Item No. 937 Inductance Loop Detection System, No.- Per lump sum

Item No. 937 Pedestrian Detection System, No.- Per lump sum

Item No. 937 Video Detection System, No.- Per lump sum

Item No. 937 Microwave Vehicle Detection System, No.- Per lump sum

Item No. 937 Wireless Magnetometer Detection System, No.- Per lump sum

Item No. 937 Temporary Vehicle Detection System, No.- Per lump sum

Item No. 937 Maintenance of Vehicle Detection System, No.- Per lump sum

Item No. 937 Continuous Count Station System, No.- Per lump sum

Item No. 937 Continuous Count Station System, Weigh-in-Motion,

No.-

Per lump sum

Item No. 937 Training; Detection System Per lump sum

Payment Notes:

Submittal

Submittal requirements will not be paid for separately. It will be considered incidental to the individual detection

system pay item.

Field Cabinet

Field cabinets for ITS and continuous count station applications will be paid for separately under Section 939.5

pay items.

Testing

Testing will not be paid for separately. It will be considered incidental to individual detection system pay items.

937.5.02 Adjustments

General Provisions 101 through 150.. 1959