660-1 Description .
Furnish and install a vehicle detection system in accordance with the Contract Documents and this Section. Meet the requirements of Section 603.
660-2 Materials.
660-2.1 General: Meet the following requirements:
Traffic Data Detection System - Microwave* .....Section 995 Vehicle Detector - Microwave* ........................... Section 995 Vehicle Detector - Video* ................................ ...Section 995 Vehicle Loop Detector* ................................ ......Section 995 Wireless Magnetometer Assembly* ................... Section 995 Automatic Vehicle Identification* ...................... Section 995 Wrong Way Vehicle Detection Systems* ...........Section 995 Loop Sealant* ................................ ..................... Section 995 Highlighted Signs* ................................ ..............Section 995 *Use products listed on the Department’s APL.
660-2.2 Classification of Types: Vehicle detection and data collection systems are
classified by the type of function they perform and the type of technology that they employ.
660-2.2 1 Functional Types: Provide the functional type detailed in the Plans.
660-2.2 1.1 Vehicle Presence Detection System s: Vehicle presence
detection systems produce a corresponding output any time that a vehicle occupies the physical or virtual area of the detector.
660-2.2 1.2 Traffic Data Detection System s: Traffic data detect ion
systems provide presence, volume, occupancy, and speed data for the lanes they are configured to monitor.
660-2.2 1.3 Probe Data Detection Systems: Probe data detection systems
provide speed data and travel times for a road segment. Probe data detectors use automatic vehicle identification (AVI) technologies to establish a unique identifier for each vehicle they detect. Thi s identifier is then transmitted to a central site where it can be matched to past or future detections of the same vehicle at different detector locations.
660-2.2 1.4 Wrong Way Vehicle Detection Systems: Wrong way vehicle
detection systems produce an alarm output when a vehicle is detected traveling in the wrong direction and may consist of more than one detection zone and may use any of the technology types. For both mainline and ramp installations, the detection system must monitor all lanes for one direction, including shoulders. The wrong way detection system must not interfere with other vehicle presence or traffic data detection systems.
660-2.2 2 Technology Types: Provide the detection technology type detailed in
the Plans. Detection technology types include inductive loop, video, thermal, microwave, wireless magnetometer, and AVI systems.
660-2.2 2.1 Inductive Loop: An inductive loop detection system uses a
minimum of one inductive loop and loop detector. The system operates by energizing and monitoring wire embedded in the road surface to detect vehicle presence and provide an output FY 2023-24 Return to Table of Contents to traffic controllers or other devices that can generate volume, occupancy, and speed data (detection output).
660-2.2 2.1.1 Loop Wire: Use No. 12 AWG or No. 14 AWG
stranded copper wire with Type XHHW cross -linked polyethylene insulation and an additional outer sleeve composed of po lyvinylchloride or polyethylene insulation that meets the requirements of International Municipal Signal Association (IMSA) 51-7.
660-2.2 2.1.2 Shielded Lead -in Cable: Use No. 14 AWG two
conductor, stranded copper wire with shield and polyethylene insu lation, meeting the requirements for IMSA 50-2.
660-2.2 2.1.3 Splicing Material: Butt-end connectors may be used
for splicing the loop wire to the lead -in cable. Butt -end connectors must be non -insulated. Use resin-core solder for soldered splices. Spl icing tape must be self -fusing silicone rubber. Ensure insulated tubing used to cover splice is heat -shrinkable, cross -linked polyethylene with a silicon sealant inside the tubing and an insulation rating of at least 600 V.
660-2.2 2.2 Video: A video ve hicle detection system (VVDS) uses one or
more cameras recommended by the manufacturer or an integrated thermal sensor and video analytics hardware and software to detect vehicle presence, provides a detection output, or generates volume, occupancy, and sp eed data.
660-2.2 2.3 Microwave: A microwave vehicle detection system (MVDS)
transmits, receives, and analyzes a FCC -certified, low -power microwave radar signal to detect vehicle presence, provide a detection output, or generate volume, occupancy, and s peed data.
660-2.2 2.4 Wireless Magnetometer: A wireless magnetometer detection
system (WMDS) uses one or more battery -powered wireless sensors embedded in the road surface, which communicates data by radio to a roadside receiver. Wireless magnetometer systems detect vehicle presence and provide a detection output to traffic controllers or other devices that can generate volume, occupancy, and speed data.
660-2.2 2.5 Automatic Vehicle Identification (AVI): An AVI detection
system use s one or more diff erent methods to collect information that can be used to establish a unique identifier for each vehicle detected and the time and location that the vehicle was detected. AVI detection systems collect data using radio -frequency identification (RFID), optica l character recognition, magnetic signature analysis, laser profiling, Bluetooth®, or other methods to establish vehicle identifier, time, and location.
660-3 Installation Requirements.
660-3.1 Installation Requirements for all Detectors: Install, configure, and
demonstrate a fully functional vehicle detection system as shown in the Plans. Connect all field equipment to the existing communication network, and provide all materials specified in the Contract Documents. Install all equipment in accordance with this Section and the manufacturer’s recommendations. Install above-ground detectors on poles or sign structures, as shown in the Plans. Furnish and install the power cable and the communication cables in accordance with the manufacture r’s recommendation. Ensure that the cables comply with NEC sizing requirements and meet all other applicable standards, specifications, and local code requirements. Do not install communication cables in the same conduit or pull boxes as power cables car rying voltage greater than 24 VDC/VAC or current in excess of 1.5 amps. Cut all wires to their proper length before assembly. Do not double back any wire to take up slack. Neatly lace wires into cables with nylon lacing or plastic straps. Secure cables FY 2023-24 Return to Table of Contents with clamps and provide service loops at all connections. Label all field wiring cables in the cabinet. In the event that power to the vehicle detection system or a subcomponent thereof is interrupted, ensure that the equipment automatically recovers afte r power is restored. Ensure that all programmable system settings return to their previous configurations and the system resumes proper operation.
660-3.2 Inductive Loop Detector Installation: Install vehicle loops in accordance with
the Contract Documents, the manufacturer’s instructions, and Standard Plans, Index 660-001.
660-3.2 1 Inductive Loop -Detector Units: Adjust the operating frequency of
each detector unit, if required, to prevent crosstalk of the units.
660-3.2 2 Saw Cuts: Use a chal k line or equivalent method to outline the
perimeter of the loop on the pavement and routes for lead -in cables. Do not allow the saw cut in the pavement to deviate by more than 1 inch from the chalked line. Ensure that all saw cuts are free of any dust, di rt, or other debris and completely dry prior to installation of the loop wire, loop wire twisted pair lead, or lead -in cable. Ensure that the top conductor of the loop wire or lead -in cable is a minimum of 1 inch below the final surface of the roadway.
660-3.2 3 Loop Wire: Ensure that all loops are wound in a clockwise manner and
the first turn of the loop wire is placed in the bottom of the saw cut, with each subsequent turn placed on top of the preceding turn. Push the loop wire to the bottom of the saw cut with a non - metallic tool which will not damage the insulation. Tag and identify the clockwise “lead” of each loop. Use alternate polarity on adjacent loops. Ensure that the hold down material is non -metallic, is placed in the saw slot using segments 1 to 2 inches long, spaced 12 inches apart, and that the distance from the top of the hold down material to the final surface of the roadway is not less than 1 -1/2 inches.
660-3.2 4 Loop Wire Twisted Pair Lead: Create a loop wire twisted pair lead by
twisting the loop wire pair a minimum of 10 turns per foot to form a loop wire twisted pair lead from the edge of the loop to the pull box located adjacent to the roadway. Place only one loop wire twisted pair lead in a saw cut. Ensure that the di stance between a twisted loop wire pair lead within the roadway is a minimum of 6 inches from any other twisted loop wire pair lead or loop, until they are within 1 foot of the edge of pavement or curb, at which point they may be placed closer together. Provide a minimum of 3 feet of twisted loop wire pair lead in the pull box located adjacent to the roadway. Do not route twisted loop wire pair lead directly through conduits to the cabinet, unless otherwise shown in the Plans.
660-3.2 5 Loop Sealant: Do not use expired products. Prepare and apply loop
sealant in accordance with the manufacturer’s instructions. Ensure that the loop sealant has cured completely before allowing vehicular traffic to travel over the sealant.
660-3.2 6 Shielded Lead -in Cable: Place the lead -in cable in the bottom of the
saw cut. Do not damage the insulation. Install no more than four lead -in cables in a saw cut. Ensure that the hold down material is no longer than 1 inch and that the distance from the top of the hold down material to the final surface of the roadway is not less than 1 -1/2 inches.
660-3.2 7 Splicing: Perform the splicing in a pull box located off the roadway,
not in the roadway itself. FY 2023-24 Return to Table of Contents Splice the black conductor of the lead -in cable to the clockwise “l ead” of the loop. Ensure that the ends of the cable jackets, twisted pair, and lead -in are encased in the loop splice material. Ensure that each loop has an individual return to the cabinet and series splicing is performed on a separate terminal bloc k in the cabinet.
660-3.2 8 Terminations: Using insulated terminal lugs, terminate lead -in cables
or twisted pair loop wire on a terminal strip, which is located in the controller or detector cabinet. Use a calibrated ratchet type crimping tool to attach the lugs to the conductors of the lead -in cable or twisted loop wire.
660-3.2 9 Loop Assembly Identification: Identify and tag each loop assembly in
the controller or detector cabinet by lane and movement number.
660-3.2 10 Inductive Loop Detector Testing and Turn -on:
660-3.2 10.1 Series Resistance: Obtain Department of Transportation
Traffic Signal Resistance Measurement Data Sheets from the Engineer. Measure and record the series resistance of each loop assembly on these data sheets. L eave a copy in the controller cabinet. If the series resistance of a loop assembly is greater than 10 Ω, inspect the loop assembly to find the cause of the excessive resistance. Correct the cause of the excessive resistance at no additional cost to the Department.
660-3.2 10.2 Insulation Resistance: Measure and record the insulation
resistance of each loop assembly and verify that the resistance is greater than 100 MΩ. Use a 500 VDC insulation tester to measure the resistance. Reference all measureme nts to a good earth ground (ground rod, metallic water pipe, etc.). Disconnect the transient suppression devices from the loop assemblies before taking any measurements. If the insulation resistance is less than 100 MΩ, determine if the lead -in cable or th e loop wire is causing the problem, and replace the defective cable or loop wire at no additional cost to the Department.
660-3.2 10.3 Loop Detector Turn -on: Connect the loop assemblies to the
appropriate inductive loop vehicle detectors and tune the de tectors in accordance with the manufacturer’s instructions. Separate the operating frequencies of vehicle detectors, in adjacent lanes, by at least 2 kHz.
660-3.3 Video Detector Installation: Install cameras and configure detection zones and
settings in a ccordance with the Contract Documents, manufacturer’s recommendations, and as directed by the Engineer. Submit configuration settings (including, but not limited to , detector names, communication settings, and output assignments) and configuration file bac kups to the Engineer. Submit a graphical depiction of each camera site, its pole location, mounting height, the ratio of distance away from the camera versus the mounting height, the camera’s mounting type (i.e., pole or structure), camera aiming procedure s, and the placement of the proposed detection zone for each lane. Do not use coaxial cable runs in excess of 500 feet. Mount and aim cameras in a manner that eliminates as much environmentally generated glare as possible.
660-3.4 Microwave Detector Ins tallation: Install detector and configure detection zones
and settings in accordance with the Contract Documents, manufacturer’s recommendations, and as directed by the Engineer. Submit configuration settings (including, but not limited to , detector names, communication settings, and output assignments) and configuration file backups to the Engineer. FY 2023-24 Return to Table of Contents
660-3.5 Wireless Magnetometer Installation: Install in accordance with the Contract
Documents, manufacturer’s recommendations, and as directed by the Engineer . Ensure that materials used for the installation of magnetometers in the road surface have cured completely before allowing vehicular traffic to travel over them.
660-3.6 AVI Detecto r Installation: Install in accordance with the Contract Documents,
manufacturer’s recommendations, and as directed by the Engineer.
660-3.7 Wrong Way Vehicle Detection Systems (WWVDS) Installation: Install in
accordance with the Contract Documents, manufacturer’s recomm endations, and as directed by the Engineer.
660-4 Acceptance Testing.
660-4.1 Vehicle Presence Detection System :
660-4.1 1 Performance Requirements: Ensure presence detectors provide a
minimum detection accuracy of 98%.
660-4.1 2 Field Acceptance Testing: Verify presence detection accuracy at
installed field sites using a reduced method in accordance with 995 -2.8.1. Compare sample data collected fro m the detection system with ground truth data collected by human observation. For site acceptance tests, collect samples and ground truth data for each site for a minimum of five minutes during a peak period and five minutes during an off -peak period. For presence detection at intersections, ensure there are a minimum of three detections for each signal phase. Perform site acceptance tests in the presence of the Engineer.
660-4.2 Traffic Data Detection System :
660-4.2 1 Performance Requirements: Provide a vehicle detection system
capable of meeting the minimum total roadway segment accuracy levels of 95% for volume, 90% for occupancy, and 90% for speed for all lanes, up to the maximum number of lanes that the device can monitor as specified by the manufac turer.
660-4.2 2 Field Acceptance Testing: Conduct field acceptance testing in
accordance with Section 611.
660-4.3 Probe Data Detection System :
660-4.3 1 Performance Requirements: Ensure that probe data detectors
establish a unique and consistent id entifier for each vehicle detected and the time and location that the vehicle was detected. Ensure probe data detection systems that match upstream and downstream detection of the same vehicle provide a minimum match rate of 5%. Ensure probe data detection systems meet a minimum total roadway segment speed and travel time accuracy level of 90%. Verify system performance over several time periods under a variety of traffic conditions as described in 995 -2.9.1.
660-4.3 2 Calculation of Speed and Travel Time Accuracy: Verify detector
accuracy at installed field sites using a reduced method in accordance with 995 -2.10. Calculate speed and travel time accuracy by comparing the speeds and travel times reported by the system against ground truth collected through human observation or another method approved by the Engineer.
660-4.4 Wrong Way Vehicle (WWVD S) Detection System : Submit a test plan for the
field acceptance test (FAT) to the Engineer a minimum of 30 calendar days before commencement of testing for review and approval; tests cannot commence or be scheduled until test plans are approved by the Engineer . For each testing phase, test plans must include descriptions of test procedures; test form with areas for test result recording, test conductor, and witness signatures; pass/fail criteria; and test schedule. FY 2023-24 Return to Table of Contents Conduct a field acceptance test for each ramp being monitored by a WWVDS. Test all local system functions using the installed WWVDS equipment as detailed in the Plans and as approved by the Engine er. Testing must demonstrate that:
1.All wiring and local configurations are correct.
2.The WWVDS is detecting vehicles driving the wrong way, in all ramp travel lanes and any paved shoulders 8 feet or wider, while ignoring vehicles traveling in the correct direction. A true positive rate of 95% or greater must be achieved . A false positive rate of 1% or less must be achieved.
3.The WWVDS is activating all wrong way highlighted signs on the ramp upon detection of a vehicle traveling in the wrong d irection and sign activation occurs before the vehicle reaches the sign. If any WWVDS fails to pass its field acceptance test, correct the unit, or substitute another unit in its place, then repeat the test. If a unit has been modified due to a field acceptance test failure, prepare a report describing the nature of the failure and the corrective action taken and submit it to the Engineer prior to re -testing. If a failure pattern develops, the Engineer may direct that design and construction modificati on be made to all units without additional cost to the Department or extension of the Contract Time.
660-4.4 1 True Positive Testing: Conduct this test on a closed ramp using
Contractor -provided test vehicles. Test each lane and paved shoulder 8 feet or wider by driving two types of test vehicles traveling at two travel speed ranges the wrong direction. For this testing, the small vehicle shall be a FHWA Class Group 2 (passenger car) vehicle , and the large vehicle shall be a FHWA Class Group 3 (pick-ups and vans) or Class Group 5 (two -axle truck) vehicle. Each ramp lane shall be subjected to the following test vehicle runs; each ramp paved shoulder 8 feet or wider must only undergo test runs described in #1 and #2.
1.Five runs of a small vehicle t raveling between 10 and 15 miles per hour.
2.Five runs of a large vehicle traveling between 10 and 15 miles per hour.
3.Five runs of a small vehicle traveling 35 miles per hour or greater.
4.Five runs of a large vehicle traveling 35 miles per hour or greater. Calculate the true positive rate using the following formula: 𝑇𝑃𝑅 = 𝑇𝑃𝑁 ⁄ ∗100 Where TPR = True positive rate %. TP = Cumulatively for all test runs, the total number of times the WWVDS correctly detected the wrong way vehicle and activated the highlighted signs. N = Total number of test vehicle runs.
660-4.4 2 False Positive Testing: Conduct this test on a ramp open to the traveling
public. Test the WWVDS by monitoring a minimum of 300 total vehicles traveli ng in the correct direction of travel passing through the WWVDS detection zones . At least 150 vehicles shall be monitored during daylight hours and at least 150 vehicles shall be monitored at night. The Engineer may reduce minimum volume requirements under low volume conditions if necessary. Calculate the false positive rate using the following formula: 𝐹𝑃𝑅 = 𝐹𝑃𝑁 ⁄ ∗100 Where: FPR = False positive rate %. FY 2023-24 Return to Table of Contents FP = Total number of times the WWVDS activated for a vehicle traveling in the correct direction. N = Total number of vehicles traveling in the correct direction.
660-5 Warranty.
Ensure that the detection system has a manufacturer’s warranty covering defects for a minimum of 2 years from the date of final acceptance by the Engineer in accordance with 5 -11 and Section 608. Ensure the warranty includes providing replacements, within 10 calendar days of notification, for defective parts and equipment during the warranty period at no cost to the Department or the maintaining ag ency.
660-6 Method of Measurement.
The quantity to be paid will be the plan quantity for each inductive loop detector and per assembly for loop assembly completed and accepted. The quantity to be paid will be the plan quantity for each MVDS, VVDS, WMDS, AVI, or WWVDS completed and accepted. The highlighted sign s for a WWVDS will be paid for in accordance with Section 700. Only one WWVDS will be paid per exit ramp, regardless of the number of signs.
660-7 Basis of Payment.
Price and payment will be full compensation for all work specified in this Section including furnishing, placement, and testing of all materials and equipment, and for all tools, labor, equipment, hardware, operational software packages and firmware, supplies, support, personnel tr aining, shop drawings, warranty documentation, and incidentals necessary for a complete and accepted installation . Payment will be made under: Item No. 660 -1 Inductive Loop Detector - each. Item No. 660 -2 Loop Assembly – per assembly. Item No. 660 -3 Vehicle Detection System - Microwave - each. Item No. 660 -4 Vehicle Detection System - Video - each. Item No. 660 -5 Vehicle Detection System - Wireless Magnetometer - each. Item No. 660 -6 Vehicle Detection System - AVI - each. Item No. 660 -7 Vehicle Dete ction System - WWVDS - each. Item No. 660 -8 Traffic Data Detection System - Microwave - each. Item No. 660 -9 Traffic Data Detection System - Video - each. FY 2023-24 Return to Table of Contents SECTION 663 SIGNAL PRIORITY AND PREEMPTION SYSTEMS
663-1 Description .
Furnish and install a signal priority and preemption system as shown in the Plans. The signal preemption system must recognize and respond to the priority of each user. Meet the requirements of Section 603.
663-2 Materials .
Use signal priority and preemption system equipment that meet the requirements of Section 995 and are listed on the Department’s Approved Product List (APL). Ensure that all materials furnished, assembled, fabricated or installed are new products. Signal priority and preemption system equipment may utilize optical, GPS, and radio frequency based technologies. Ensure that in -vehicle equipment operates without requiring any action from the vehicl e operator or occupants once power is applied .
663-3 Installation .
Installation of materials must be in accordance with the manufacturer’s instructions. Install the emergency preemption system including installation of detectors with all necessary hardware and software, mounting hardware, cabl ing, and all other associated electronics in cabinet necessary to create a fully functional emergency preemption system. Ensure that status indicators remain unobstructed and visible.
663-4 Field Testing .
Subject th e system to field acceptance tests (FATs). Develop and submit a test plan for FATs to the Engineer for approval. The Engineer reserves the right to witness all FATs.
663-5 Warranty.
Ensure that the manufacturer will furnish replacements for any part or eq uipment found to be defective during the warranty period at no cost to the Department or the maintaining agency within 10 calendar days of notification. Ensure that the priority and preemption system has a manufacturer’s warranty covering defects for five years.
663-6 Method of Measurement.
The Contract unit price for each signal priority and preemption system, furnished and installed, will include furnishing, placement, and testing of all equipment and materials, and for all tools, labor, hardware, operational software packages and firmware, supplies, support, personnel training, shop drawings, documentation, and incidentals necessary to complete the work.
663-7 Basis of Payment.
Price and payment will be full compensation for all work specified in this Section. Payment will be made under: Item No. 663- 1- Signal Priority and Preemption System FY 2023-24 Return to Table of Contents
Source: Florida Standard Specifications for Road and Bridge Construction, 2024 Edition. Pages 894–900 of 1,299.