9-210 Section 922. Temporary Traffic Control Materials
922.01 Description
Temporary traffic control devices must meet the design requirements of the MMUTCD, Part 6 , Materials Quality Assurance Procedures Manual, and the requirements of section 922. Provide the Engineer with certification and an FHWA acceptance letter stating that the materials and devices meet the requirements of this section. Certification documents and the FHWA acceptance letter do not waive material and device inspection, sampling, or testing requirements.
922.02 Temporary Signs
A.Sign Panel and Supports . Temporary signs must meet NCHRP -350 crashworthy requirements or the requirements of the AASHTO Manual for Assessing Safety Hardware (MASH), as applicable.
1.Portable Sign Systems . Portable sign systems must meet the following requirements:
a.Signs for which the substrate totals 20 square feet or less must be constructed with t he materials and design features specified in the associated FHWA acceptance letter.
b.Signs must have a 5-foot minimum bottom height and one or two rigid legs.
c.The leg of bases with only one rigid leg must have an “X” or “H” configuration.
d.Temporary ground- driven sign systems must be constructed as described in the Maintaining Traffic Typical WZD -100 or other NCHRP -350/MASH accepted design.
2.Portable Sign Substrate . Portable sign substrates must conform to the materials requirements of section 919 and the fol lowing requirements:
a.Rigid sign panels no greater than 3 by 3 feet must be aluminum sheet , plywood , or corrugated plastic .
b.Rigid sign panels larger than 3 by 3 feet and up to 8 feet in width must be plywood or corrugated plastic .
c.Rigid sign panels 8 to 12 feet wide must be plywood or extruded aluminum. MDOT Standard Specifications for Construction Section 922 9-211 d. Rigid sign panels with a width greater than 12 feet must be extruded aluminum.
e.Temporary sign panels fabricated with plywood must have a minimum thickness of ½ inch. No vertical joints in sign substrates or horizontal splices through legends or symbols are permitted.
B.Reflective Sheeting . Reflective sheeting must meet or exceed the requirements of ASTM D4956 for Type VIII reflective sheeting. Orange sheeting must be fluorescent orange reflective sheeting.
C.Legend . Legend fabrication and application must meet the requirements of the Michigan Standard Highway Signs Manual.
D.Sign Covers . Cover material for permanent signs and temporary signs on driven supports must be exterior -grade plywood, hardboard, sheet metal, aluminum, or rigid plastic capable of resisting deterioration from weathering and atmospheric conditions for the duration of the project . Do not use flexible materials on permanent signs . Flexible materials are allowed only on temporary signs. Covers must be opaque during all light and weather conditions and must cover the entire front of sign panels.
922.03 Channelizing Devices
Channelizing devices include cones, drums, 42-inch channelizing devices, and Type III bar ricades . Reflective sheeting for channelizing devices must meet or exceed the requirements of ASTM D4956 for reboundable Type IV reflective sheeting. The fl uorescent orange sheeting must have a d aytime luminance factor that meets or exceeds 20 based on Table 2 of ASTM D4956 – Daytime Luminance Factor (Y%)
A.The white sheeting must have a d aytime luminance factor that meets or exceeds 27 based on Table 2 of ASTM D4956 – Daytime Luminance Factor (Y%)A. Provide certification from the manufacturer that devices meet NCHRP 350/MASH requirements.
A.Cones . Traffic cones must be predominantly orange, at least 28 inches high, and made of material capable of withstanding impact without damaging vehicles.
B.Drums . Drums must be composed of a low -density PE plastic . Do not use HDPE for plastic drums . The drum -striping design must meet the requirements of WZD -125.
C.42-Inch Channelizing Devices. Forty -two-inch channelizing devices must meet the following requirements: MDOT Standard Specifications for Construction Section 922 9-212 1. Have 42-inch minimum height and may include a handle or lifting device that extends above the 42-inch height;
2.Be fabricated of material capable of withstanding impact without damaging vehicles;
3.Have a base at least 8 inches in diameter and taper to at least a 4-inch diameter at the top, regardless of orientation;
4.Be predominantly orange;
5.Include ballast meeting the manufacturer ’s specifications as necessary to keep them upright; and
6.Sheeting pattern must consist of four 6-inch alternating orange and white bands with no more than 2 inches between the bands, with the top band being orange and spaced no greater than 4 inches from the top of the device.
D.Temporary Tubular Markers . Tubular markers must mee t the following requirements :
1.Consist of a vertical tube (post) with alternating white and orange reflective sheeting, a flexible boot to provide impact rebound and prevent excessive whiplash, and a base.
2.Fabricated from material that can be struck without causing damage to the impacting vehicle and that is resistant to impact, UV light, ozone, and hydrocarbons and remains resistant at air temperatures from – 20 to +120°F.
3.Provide for easy and quick removal of the post from the base and boot members.
4.Exhibit good workmanship, free of burns, discoloration, contamination, and other objectionable marks or defects that affect appearance or serviceability.
5.Must be predominantly orange and not less than 42 inches high and 2 inches wide facing road users . Have a minimum width of 2 inches throughout the entire post and be a minimum of 42 inches above the ground surface when assembled unless otherwise approved by the Engineer.
6.Be capable of withstanding a minimum of 15 impacts at a speed of 50 mph into the traff ic face of the post and remain serviceable.
7.Meet the crashworthy requirements of NCHRP 350 or MASH hardware. MDOT Standard Specifications for Construction Section 922 9-213 8. Have four 4- to 6-inch-wide alternating orange and white stripes with the top stripe being orange. The bands must be made of ASTM Type III Flexible High Intensity Sheeting placed a maximum of 2 inches from the top.
E.Type III Barricades. Type III barricades consist of three horizontal reflectorized rails, supports, and warning lights . Type III barricades must have both side s of the rails reflectorized with Type IV high-intensity sheeting. Type III barricades must meet WZD -125.
F.Temporary Delineators. Temporary delineators must meet the crashworthy requirements of NCHRP 350 or MASH hardware. Exhibit good workmanship, free of burns, discoloration, contamination, and other objectionable marks or defects that affect appearance or serviceability.
1.Temporary Delineator Panels. Provide temporary delineator panels meeting all of the following requirements:
a.Panels must consist of a vertical panel that is 8 inches in width and 24 inches in height and mounted with a bottom height of 2 feet. They must have alternating diagonal fluores cent orange and white stripes with a thickness of 6 inches sloping downward at an angle of 45 degrees in the direction vehicle traffic is to pass and be made of sheeting meeting the requirements of ASTM Type IV sheeting. The fluorescent orange must meet the requirements as described in the MMUTCD and 23 CFR Part 655, Subpart F, Appendix.
b.Panels must be at least 3/8-inch-thick corrugated plastic and attached to a sign post in accordance with subsection 810.03.B.
2.Temporary Flexible Delineators. Provide tempor ary flexible delineators meeting all of the following requirements:
a.Flexible delineators must consist of a vertical post with four 6-inch alternating white and fluorescent orange reflective sheeting with the top band being fluorescent orange. The bands mus t be made of ASTM Type IV sheeting, placed a maximum of 2 inches from the top, a flexible boot to provide impact rebound and prevent excessive whiplash, and a base. The fluorescent orange must meet the requirements as described in the MMUTCD and 23 CFR Part 655, Subpart F, Appendix.
b.Fabricated from material that can be struck without causing damage to the impacting vehicle and resistant to impact, UV light, MDOT Standard Specifications for Construction Section 922 9-214 ozone, and hydrocarbons, and resistant at temperatures from –20 to +120°F.
c.Allows removal of the pos t from the base and boot members.
d.Be predominantly orange, not less than 42 inches high, and 2 inches wide facing oncoming traffic.
e.Capable of withstanding a minimum of 15 impacts at a speed of 50 mph into the traffic face of the post and remain serviceabl e.
922.04 Temporary Concrete Barrier and Endings
Concrete barrier, endings , and associated hardware and impact attenuators must meet or exceed NCHRP -350 Test Level 3 or MASH Test Level 3 requirements.
A.Temporary Concrete Barrier . Temporary concrete barrier must be eligible for F ederal aid reimbursement by FHWA . The tested maximum deflection must not exceed 6½ feet when installed. Provide certification documenting that the concrete used in fabricating the barrier sections meets or exceeds the requirements of the concrete used in crash-tested sections. Provide temporary barrier sections of lengths equal to or greater than the sections that were successfully crash tested under NCHRP 350 TL- 3 or MASH TL -3 criter ia. Ensure that lengths of temporary barrier sections are adequate for achieving the required curvature or deflection in barrier alignment. The bottom width of barrier sections must not exceed 28 inches. The top of sections must be flat and at least 6 inches wide. Cast barriers using concrete equivalent to or exceeding the requirements of that used in similar temporary concrete barrier sections that were successfully crash tested according to the requirements of NCHRP 350 TL-3 or MASH TL -3. Cure in accordance with subsection 804.03.F . Cast barriers in accordance with the weather and temperature limitations specified in subsection 602.03.T . Provide a uniform, smooth finish on temporary concrete barrier surfaces. The Contractor may use lifting devices or openings to enhance placement . Ensure that lifting devices do not protrude from the sides or top of the barrier when the barrier is in place. Install barrier reflector s on temporary concrete barrier s to delineate the barrier wall . Reflectors must be trapezoidal or rectangular and include a methyl acrylate reflective area of at least 7.5 square inches. Initial photometric requirements at 0.2-degree observation angle and 0- degree MDOT Standard Specifications for Construction Section 922 9-215 entrance angle must be at least 9 candel a per lux for white markers and 6.5 candela per lux for yellow markers.
B.Temporary Concrete Barrier Ending . Provide concrete barrier endings meeting end MDOT Standard Plan R -126 series and section 812. The cross section and connection type for concrete barr ier endings must match the cross section of the end of the in- place concrete barrier. Impact attenuator devices must be constructed from material specified by the manufacturer and in accordance with the MDOT Standard Plan R -49, R-54, and R -126 series. Construct concrete attenuator base pads, foundations, anchor blocks, or backup units using Grade 4000 S1 concrete . Ensure that the impact attenuator transition assemblies, transition panels, end panels, connections , and other miscellaneous accessori es required for installation meet the manufacturer ’s specifications. Provide all modules in a sand module attenuator array from the same manufacturer . Do not mix different types of modules . Provide sand for filling sand module attenuators meeting the gradation and moisture content requirements specified by the manufacturer.
922.05 Temporary Guardrail
Use existing guardrail beam elements , posts , and guardrail approach terminals for reconstructing guardrail if the Engineer determines that the material is reusable in its present condition. If existing material is not reusable, provide new guardrail panels, posts, bolts, reflectorized washers, and other fittings. Provide new guardrail beam elements and associated hardware and posts meeting the requirements of s ections 908 and 912. Provide new guardrail posts of the same type as existing posts .
922.06 Temporary Pavement Markings
Temporary pavement markings consist of painted lines, pavement marking tape, and temporary raised pavement markers (TRPMs).
A.Pavement Marking Materials. Select paint, preformed tape, and TRPM s from the Qualified Products List.
1.Pavement Marking, Wet Reflective, Type R . Provide wet reflective Type R temporary pavement marking as preformed tape. Select wet reflective Type R markings from the Qualified Products List (922.06A) . Apply and remove preformed tape in acc ordance with the MDOT Standard Specifications for Construction Section 922 9-216 manufacturer ’s instructions . The tape must remain flexible and conform to the texture of the pavement surface during use.
2.Pavement Marking, Wet Reflective, Type NR Paint . Provide wet reflective Type NR temporary pavement markings as paint reflectorized with a wet reflective optic system recommended by the manufacturer and as approved by the Engineer , as required.
a.Wet Nigh t Retroreflectiv e Optics. Select wet reflective ( WR) optics from the Qualified Products List or a Department -approved alternative that meets or exceeds the requirements in Table 922- 1. Table 922- 1 Temporary Wet Reflective Type NR Pavement Markings : Average Initial Retroreflectivity at 30- meter G eometry in mcd/lux/sq m with F low of Placement Test Method Color White Yellow Dry (ASTM E1710) 700 500 Wet recovery (ASTM E2177) 250 200 Wet continuous (ASTM E2832) 100 75 Ship the material to the job site or Contractor’s yard in sturdy containers mark ed in accordance with subse ction 92 0.01. A. Select glass beads for corresponding materials in accordance to subsection 920.02. Submit to the Engineer prior to the start of work a general certification from the manufacturer that when the glass beads and optics are applied according to the constru ction methods herein, they will meet the minimum requirements shown in Table 922-1 .
b.Binder Material for Temporary Wet Reflective Type NR Pavement Markings. Select the liquid applied pavement marking from one of the following materials from the Qualified Products List to use as a binder for the WR optics or as an alternative as approved by the Engineer: 811.03D 1 Waterbor ne, Liquid Pavement Marking Materi al 811.03D 2 Low Temperature Water borne, Liquid Pavement Marking Materi al 811.03D 3 Regular Dry Paint, Liquid Pav ement Marking Materi al
3.Pavement Marking, Wet Reflective, Type NR Tape. Provide wet reflective Type NR temporary pavement markings as preformed tape. The tape must remain flexible and conform to the texture of the MDOT Standard Specifications for Construction Section 922 9-217 pavement surface during use . Select wet reflective Type NR tape from the Qualified Products List (922.06A) .
B.Temporary Raised Pavement Markers (TRPM s). Select TRPMs f rom the Qualified Products List . Provide TRPM s reflectorized on one or both sides, depending on exposure to one-way or two -way traffic . Install TRPMs usi ng the manufacturer ’s recommended adhesive and in accordance with the manufacturer ’s instructions.
1.TRPM Type 1. TRPM Type 1 consists of a flexible retroreflective strip with a protective removable plastic shield that the Contractor may use as a temporary pavement marking on an HMA pavement surface before applying chip seal.
2.TRPM Type 3. TRPM Type 3 consists of a solid plastic device with a retroreflective face surface that the Contractor may use as a durable temporary pavement marking.
C.Pavement Marking Cover . Select the pavement marking cover from the Qualified Products List . Preformed polymer tape pavement marking covers must have a black non- reflective matte finish. In addition to the requirements of subsection 922.06.A.1, pavement marking cover tape must meet the following requirements and characteristics:
1.Be 6 inches wide;
2.Be at least 0.04 inch thick, not including adhesive;
3.Be pre-coated with a pressure -sensitive adhesive capable of adhering to existing markings;
4.Contain no metallic foil;
5.Consist of a mixture of high- quality polymeric material, pigments, and inorganic fillers distributed throughout the base cross -sectional area with a black non-reflective matte finish top layer with non-skid particles;
6.Provide an initial average surface skid resistance value of 60 BPN when tested in accordance with ASTM E303;
7.Remain in usable condition for 1 year after the receipt date when stored in accordance with the manufacturer ’s recommendations; and
8.Be manually removable in large pieces at temperatures greater than 40°F without using heat, solvents, grinding, or blasting. Ensure that the tape, when applied in accordance with the manufacturer ’s recommendations, provides a neat, durable masking that does not flow or distort on a stable pavement surface due to high temperature. Provide MDOT Standard Specifications for Construction Section 922 9-218 weather -resistant film capable of withstanding normal traffic wear without lifting, shrinking, tearing, rollback, or other signs of poor adhesion. Incorporate a non-metallic medium to facilitate removal.
922.07 Lighting Devices
A.Lighted Arrow, Types B and C . Lighted arrows for traffic control in work zones consist of a lighted arrow panel, controller, and a power supply mounted on a heavy -duty trailer.
1.Lighted Arrow Panel . Lighted arrow panels must have a flat black non-reflective surface and lights on the back to indicate the message mode that is in operation. Type B panels must be at least 30 inches high by 60 inches wide and be equipped with 13 LED amber lights . Type C panels must be at least 48 inches high by 96 inches wide and be equipped with 15 LED amber lights . Program lights to present the following flashing message modes:
a.Left arrow ;
b.Right arrow ;
c.Double arrow ; and
d.Caution.
2.Controller . Lighted arrows must have a photoelectrical control circuit that automatically adjusts the lamp intensity to ambient light conditions and with no m anual override. An automatic intensity control that keeps the lamps at constant brightness when the battery is low is required.
3.Power Supply . Lighted arrows must have a solar power supply with a battery backup and a built -in 110 VAC battery charger . When fully charged, the arrow panel must be capable of operating for 20 days in single arrow mode with the photocell covered.
4.Legibility . The arrow panel must have an average legibility of 1 mile and must be legible from ½ mile if viewed 10 degrees from center . Ensure that installed ar row panels meet the legibility requirements of subsection 812.03.D. 8.
5.Trailer . The trailer and trailer components, with the exception of the sign panel, must be painted in highway orange. Delineate the trailer with a 2 - by 36-inch strip, or an equivalent area, of reflectorized red and white conspicuity tape, installed on each of the four sides of the trailer . Locate these strips at each corner of the trailer. MDOT Standard Specifications for Construction Section 922 9-219 B. Warning Lights . Provide warning lights with LED s. Type A, Type B, and Type C warning lights must meet the requirements in ITE’s Purchase Specification for Flashing and Steady Burn Warning Lights . Lights must be battery or solar powered. Provide the following types of warning lights as required:
1.Type A : Low-intensity flashing warning light with a yellow lens.
2.Type B : High-intensity flashing warning light with a yellow lens and a visor to shield the lens from overhead sunlight.
3.Type C : Steady burn warning light with a yellow lens.
4.Type D : 360-degree steady burn warning light w ith a yellow lens . Lenses for Type D lights must be visible for 360 degrees , and the LED light source must emit light equally for 360 degrees . The LED light source must sustain constant brightness, evenly distributed throughout the lens until unable to maintain the intensity requirements specified in subsection 812.03.G.6.
C.Portable Changeable Message Signs. A portable changeable message sign (PCMS) consists of a message board with an LED display, controller, solar/battery equipment, and power supply mounted on a heavy -duty towable trailer . The materials, equipment, and components of the PCMS must be commercial off -the-shelf products . Provide PCMS meeting the following :
1.Message Board . The PCMS message board must meet the following requirements:
a.Measures at least 75 inches high by 114 inches long and be capable of displaying at least three lines of text and at least eight characters on each line. The display may be a line-matrix or character -matrix design;
b.Is disk matrix, LED, or disk matrix and LED capable of displaying three message lines with a character height of 18 inches, eight characters per line, and a pixel matrix that is 5 pixels wide and 7 pixels high;
c.Provide s spacing between characters at least twice the element stroke width;
d.Is pre-loaded with at least an 18 -inch standard font;
e.The PCMS display s: All uppercase letters; Up to three lines of t ext per sign; and MDOT Standard Specifications for Construction Section 922 9-220 All numerals 0 to 9.
f.Includes a photocell to regulate the internal lighting system . Disk matrix PCMS must have fluorescent lighting at the top and bottom of each message line. The PCMS must automatically adjust the display brightness bas ed on lighting conditions to maintain legibility to motorists at all times.
g.Includes a sighting device to ensure required alignment.
h.Is rainproof and uses materials that resist degradation due to exposure to UV light.
i.LED PCMS must have forced- air ventilat ion and filtered inlets to maintain the interior temperature within temperature limits for LEDs.
j.When displaying 18-inch characters, the display is legible between distances of 200 to 1, 000 feet, with a 20-degree LED viewing angle for both day and night operations . All 20 -degree LEDs have a nominal viewing cone angle of 20 degrees with a half -power angle of 10 degrees measured from the longitudinal axis of the LED.
2.Controller . PCMS controllers must be equipped with the following:
a.Micro -processor -based unit with a storage capacity of at least 50 preprogrammed messages;
b.Non-volatile memory capable of retaining the messages during a non-power period;
c.Password security feature to prevent unauthorized use;
d.Message display capable of dis playing a variable message at a rate of 0.25-second increments or correlated to 0.25-second increments; and
e.Message display panel showing the message on the sign or created on the keyboard and capable of giving the operator programming instructions.
3.Electr ical/Electronics . Control cabinet for PCMS must be equipped with the following:
a.Lockable door and an interior light for night operations.
b.Ventilated cabinet with screen covering on the vents to prevent damage from insects. MDOT Standard Specifications for Construction Section 922 9-221 c. NEC 400 -10 and NEC 400-14 compliant connections to control cabinets and sign board.
d.IMSA Wiring and Cable Specifications 20-1, 20-2, 20- 5, and 20-6 compliant external electrical wiring.
e.Shock -mounted sign electronics to reduce vibration. Provide shock mountings in the circuit designs, mechanical supports for drive transistors, and in the type of conformal coating.
f.Printed circuit boards mounted with spring-load tension screws for ease of access and removal.
4.Power Supply . Power supply to the PCMS must be a maintenance-free battery with one of the following backup systems:
a.Generator with electric start capable of continuous operation without refueling for 72 hours;
b.Solar with a built -in 115 VAC battery charger capable of displaying a message for a minimum of 18 consecutive days w ithout sun in 16°F weather conditions.
c.The power source is able to continuously display a message of at least 24 characters, 24 hours per day, 7 days per week, for the duration that the PCMS is deployed in the field.
5.Trailer
a.The PCMS trailer must be paint ed highway orange.
b.Delineate the trailer with a 2 - by 36-inch strip, or equivalent area, of reflectorized red and white conspicuity tape, installed on each of the four sides of the trailer . Locate the strips at each corner of the trailer.
c.The trailer must conform to the Michigan Vehicle Code with a nonskid upper surface.
d.The PCMS must be mounted to the trailer with a message board support that moves up and down and rotates 360 degrees and has a safety bolt to prevent the message board from lowering once in the raised position. The support must be equipped with a hydraulic system that includes a manual pump with manual release for use as a backup for the electric hydraulic pump.
e.The bottom of t he sign panel must be at least 7 feet above the roadway in urban areas and 5 feet above the roadway in rural areas when in operating mode. MDOT Standard Specifications for Construction Section 922 9-222 922.08. Temporary Traffic Signals and Street Lighting The Contractor may provide used material and equipment for temporary traffic signals and street lighting with the Engineer ’s approval . The Contractor is responsible for the performance and maintenance of used material throughout the life of the project.
922.09 Temporary Traffic Signals
Material for temporary traffic signals must mee t the requirements of section 918 and section 921, the ITE LED Circular Signal Supplement , and the MMUTCD.
922.10 Temporary Portable Traffic Signal System
Material for temporary portable traffic signal (PTS) systems must meet the requirements of section 918 and s ection 921, the ITE LED Circular Signal Supplement , and the MMUTCD.
A.Trailer . PTS trailer must be self -contained and meet the following requirements:
1.Consist of a vertical upright and horizontal mast arm to accommodate two 12-inch overhead traffic signal he ads, mounted at the same height, and capable of providing at least 16 feet of clearance;
2.Allow at least one signal head on the horizontal mast to be placed over the traffic lane;
3.Conform to the wind load requirements specified by AASHTO ’s Standard Specific ations for Structural Supports for Highway Signs, Luminaires, and Traffic Signals with all equipment mounted without the need for additional ballast ;
4.Allow for transporting two signal trailers with one vehicle;
5.Have adequate structural integrity to allow for lifting and placing the PTS trailer, as required.
6.Conform to the Michigan Vehicle Code;
7.Be equipped with four stabilizing and leveling jacks, one on each corner of the trailer ; and
8.Be delineated with a 2 - by 36-inch strip, or an equivalent area, of reflectorized red and white conspicuity tape, installed on each of the four sides of the trailer . Locate the strips at each corner of the trailer. MDOT Standard Specifications for Construction Section 922 9-223 B. Traffic Signal Heads/Display Requirements. The PTS system must meet the following requirements:
1.Conform to the physical display and operational requirements of conventional traffic signals, as specified in Part IV of the MMUTCD, ITE LED Circular Signal Supplement , and NEMA TS-5 standards;
2.Be equipped with two overhead, 12-inch, LED traffic signal heads with visors that extend beyond the signal head at least 10 inches;
3.Be equipped with traffic signal heads that can accommodate back plates and that rotate horizontally 180 degrees; and
4.Provide traffic signal head clearance height of at least 16 feet, measured from the bottom of the green signal housing or signal back plate, whichever is lower , to the road surface.
C.Power Requirements. Each PTS trailer must be equipped with batteries capable of operating the traffic signal system for at least 21 days at 72°F without charging. Provide a charging system that includes at least 450 watts of solar collection capability , an onboard battery charger for use with a 110-volt power source, and an onboard monitoring system capable of regulating and providing a vi sual display of the battery voltage and solar input. The PTS system must be fully operable if connected to a 110-volt power source.
D.PTS Operational Requirements. The PTS must have an operating system that includes a conflict monitoring system that conforms to NEMA TS-5 standards and is capable of operating in a fixed-time, traffic -actuated, or manual control mode. The fixed-time mode operation option must be capable of providing at least five automatic traffic signal timing changes in a 24-hour period. The traffic -actuation mode option must allow minimum and maximum green time programming to extend the green times in predetermined programmable segments. In addition, the PTS operating system must meet the following requirements:
1.Control at least seven traffic phases and include programmable green times from 3 seconds to 250 seconds and red times from 1 second to 250 seconds in 1-second increments ;
2.Facilitate standby modes of red, red flash, and yellow flash;
3.Capable of interfacing with a remote monitoring system that report s signal location, battery voltage, and system defau lt. Ensure that the MDOT Standard Specifications for Construction Section 922 9-224 monitoring system is not limited to cellular phone coverage areas and remains operational regardless of location;
4.Can accommodate a pre- emption system with optical ac tivation that provides a priority green phase in the direction of equipped approaching emergency vehicles ;
5.Allows for connect and control of the PTS by a standard NEMA -type controller ;
6.Be equipped with diagnostic capabilities in the event of a system failure and can identify the failure to expedite return to full operational mode; and
7.Has an integrated mechanism capable of recording system malfunctions and providing a printout of this record that must be kept with the PTS, including the following:
a.Date and time of system failure;
b.Service and maintenance performed;
c.Description of the equipment serviced and why the service was performed;
d.Repairs made to the unit ; and
e.Past operational history of the unit.
E.Actuation Requirements . PTS system must have traffic-act uation capabilities that include microwave motion sensors, video detection, and in-pavement loops . The PTS system must be capable of operating with a motion and true-presence actuation system.
F.Communication Requirements . Equip the PTS system to communicate via hardwire connection or wireless radio link communication. If using the hardwire communication, do not obstruct vehicular and pedestrian traffic or intrude into the work area while deploying the communication cable. If using the radio link communication optio n, ensure that the radio system conforms to FCC requirements and applicable state and local requirements.
G.Default Requirements. Program the PTS system to revert to a red, red flash, or yellow flash mode upon system failure . Set the default setting to red flash or a preprogrammed operating mode to ensure safety in the work zone . Upon failure, ensure that the PTS system can notify Contractor personnel via the remote monitoring system. MDOT Standard Specifications for Construction Section 922 9-225 922.11. Traffic Regulator Equipment
A.Stop/Slow and Stop/Stop Sign Paddle . Equip traffic regulators with a stop/slow or stop/stop paddle meeting the MMUTCD . Do not use red flags except in case of emergencies.
B.Traffic Regulator ’s High -Visibility Safety Apparel . Traffic regulators must wear high -visibility safety apparel as specified in the MMUTCD.
C.Traffic Regulator Apparel . Ensure that traffic regulators wear head, eye, and foot protection as specified in the provisions of Construction Safety Standard, Part 6 , “Personal Protective Equipment ” (Michigan Administrative Code, R408.40601 et seq. ).
D.Two-Way Handheld Radio System . Provide a two-way handheld radio system with power to send and receive signals over the length of the intended flagging operations . Provide a backup system on standby, readily available to the regulators . The handheld radio system must not be attached to a vehicle.
922.12 Miscellaneo us
A.Dust Palliative. Calcium chloride (CaCl 2) dust palliative in solid or liquid form must conform to the requirements of ASTM D98 except as modified by this subsection. Solid-form CaCl 2 must have a minimum concentration of 77% CaCl 2 with 100% passing the ⅜ -inch sieve and from 0 to 5% passing the No. 30 sieve. Liquid-form CaCl 2 must be a solution with a concentration of 33, 35, or 38% CaCl 2. Provide two copies of a report, with each load, that includes the following information:
1.Volume in gallons or weight of solution delivered or the weight of solids delivered;
2.Concentration of solids or solution delivered, expressed as the percent of CaCl 2;
3.Equivalent tons of CaCl 2 determined for the concentration shown on the delivery report in accordance with Table 922- 2; and
4.Copy of manufacturer ’s certification that the CaCl 2 conforms to this section. MDOT Standard Specifications for Construction Section 922 9-226 Table 922- 2: Equivalent Weight of Calcium Chloride Concentration Pounds of Calcium Chloride Per Gallon of Solution Per Pound of Solution or Solids 33% 3.7 0.33 35% 3.9 0.35 38% 4.4 0.38 77% N/A 0.77 If the manufacturer ’s certification indicates that a solution does not conform to the concentration stated on the report, the Engineer will use the value from Table 922-2 for the next lower concentration to which the solution conforms to calculate the equivalent weight of CaCl 2. If the manufacturer ’s certification indicates that a solution has a concentration less than required for a 33 % concentration or that a quantity of solids has a concentration less than required for 77% concentration, the Engineer will calculate the weight of equivalent CaCl 2 using the required concentration. If manufacturer ’s certification indicates a concentration of CaCl 2 greater than stated on the delivery report, the Engineer will calculate the weight of equivalent CaCl 2 using the concentration indicated on the report.
Source: Michigan Standard Specifications for Construction, 2020 Edition. Pages 1020–1036 of 1,146.