9−53equipment, including surface preparation and adhesives, and all incidentals required to finish the work, complete and accepted by the Engineer. SECTION 928 TRUCK MOUNTED ATTENUATOR (TMA) WITH TRUCK MOUNTED FLASHING ARROW BOARD (TMFAB)
928.01 DESCRIPTION. This work consists of providing, operating, and maintaining truck mounted
energy absorbing impact attenuators, replacem ent attenuator cartridges, and truck mounted flashing arrow boards, at the locations indicated on the Plans or as directed by the Engineer, all in accordance with these Specifications. 928.02 MATERIALS. 928.02.1 Truck Mounted Attenuator (TMA). The TMA is a lightweight attenuation system designed for installation at the back of traffic control trucks. It consists of three basic component sections - a crushable module, a lightweight steel backup, and a support frame for attaching the backup to the truck. The complete TMA shall be designed to make attachment or detachment from the truck simple and fast and shall be installed in accordance with the manufacturer's recommendations.
a.Module Materials. Light fixtures shall consist of combination run, turn, brake, and side clearance lights with ICC identification lights on the rear of the TMA. All light fixtures shall have rubber grommet seals. A standard SAE/AT/TTMA interchangeable 7-way trailer light wire connector shall be installed and wired to SAE standards. All standard modules shall have a chevron patte rn painted on the rear of the module. The standard chevron pattern shall have 4-inch wide st ripes, alternating black and yellow, slanted at 45 degrees in an inverted "V" form with the "V" located at the center of the module. All standard modules assembly shall be covered for debris containment during an impact and for environmental protection.
b.Crushable Frame. The crushable frame which supports the TMA assembly shall be fabricated from standard steel shapes. The module shall be fastened to the internal frame.
c.Steel Backup. The steel backup shall be special lightweight assembly which shall support the TMA cartridge during normal use and shall resist the loads applied to it during impacts. 9−54 This backup shall be capable of tilting upward toward the truck 90 degrees for travel or storage. Positions will be either 90 degrees or horizontal.
d.Attachment to the Truck. The TMA shall be designed to interface with a truck as specified herein. Engineers from the TMA manufacturers shall be supplied with a dimensional layout sheet of the truck to which the TMA will be attached. The interface structure between the TMA and the truck will then be custom fabricated by TMA manufacturers.
e.Metal Work-Fasteners. All metal work shall be fabricated from ASTM A36 or M1020 merchant quality steel. After fabrication, all metal work shall be coated with metal primer and painted black. All welding shall be done by, or under the direction of, a certified welder. All bolts, nuts, and washers shall be corrosion resistant American National Standard.
f.Wire Rope . All wire ropes shall be 3/8-inch diameter galvanized, 7 x 19 aircraft cable manufactured to Military Specifications.
g.Weight . The TMA with 90-degree tilt shall weigh approximately 1200 pounds.
h.Hydraulics . The TMA with 90-degree tilt shall have a 12 volt D.C. hydraulic pump and cylinder which will be used to tilt the Hex-Foam module 90 degrees up from horizontal position. The hydraulic pump shall be supplied with a remote activation switch.
i.Wheel Jacks . The TMA with 90-degree tilt shall be capable of accepting two hand crank swivel jacks and two swing jacks at the rear to assi st in the removal of the module and backup from the truck. These jacks shall have wheels to provide portability of the TMA once it is removed from the truck.
j.Testing Criteria . The TMA until shall have been tested to the criteria as listed in the National Cooperative Highway Research Program No . 350, dated 1993. A copy of the results of such testing must be available upon request and have been written by a Registered Professional Engineer. The TMA shall be capable of passing the following tests:
1.Vibration . Eight hours of constant vibration with a frequency of 5 HZ and a minimum amplitude of .5-inch, input at the base of the backup. The intent of this test is to simulate worst case road vibrations.
2.Moisture . Twenty-four hours of simulated rain on the top of the unit at the rate of 10 inches per hour. Twenty-four hours of simulated rain on the bottom of the unit at 10 inches per hour. The test should result in no water accumulation or moisture absorption by the module material.
3.Corrosion . When subjected to 50 hours of salt spray (fog), in accordance with ASTM B117, the energy absorbing material shall show no signs of corrosion or decrease in the energy absorbing capacity of the material. 928.02.2 Replacement Cartridges. The Contractor shall have a r eplacement cartridge available at all times. In the event that the original TMA is damaged due to a crash of an oncoming vehicle during construction the replacement cartridge will be used. The replacement cartridge shall include the module, internal support system, and hydraulic jacks. If the original TMA is damaged, the 9−55replacement cartridge will be used and a third cartridge will be ordered and paid for on a Force Account basis as set forth in Subsection 109.04, Para. a.4 of these Specifications.
928.02.3 Truck Mounted Flashing Arrow Board (TMFAB). Attached to the traffic control truck,
as described herein, shall be an illuminated truck mounted flashing arrow board. The TMFAB shall be a 4 foot by 8-foot board mounted at the rear of the truck. The TMFAB shall contain at least 12 #4412A (or equal) amber lights each of which shall have approximately 6,000 initial maximum candle power with a flash rate of approximately 30 per minute and which shall indicate an arrow to the left, an arrow to the right or an arrow to both sides simultaneously to warn approaching tr affic. The center of the arrow shall be mounted a minimum of 9 feet above the roadway. For nighttime use t he unit shall be equipped for lamp intensity reduction to eliminate glare. The TMFAB shall be powered by a diesel-fuel ed generator equipped with backup batteries.
928.02.4 Traffic Control Truck. The Contractor shall provide a truck weighing between 10,000
pounds to 24,000 pounds or one specified by the manufacturer and approved by the Engineer. The truck shall be adaptable to mounting the TMA and TMFAB to the rear of the truck. 928.03 CONSTRUCTION METHODS . The TMA and TMFAB shall be available for use throughout the duration of the Contract. It shall be positioned and repositioned at the direction of the Engineer. The Contractor shall properly maintain the TMA and TMFAB throughout the Contract period.
928.04 METHOD OF MEASUREMENT. "Truck Mounted Attenuator with Truck Mounted Flashing
Arrow Board" will be measured by the number of day s each such assembly is actually employed in the work or as directed by the Engineer. 928.05 BASIS OF PAYMENT. The accepted quantity of "Truck Mounted Attenuator with Truck Mounted Flashing Arrow Board" will be paid for at the contract unit price per day as listed in the Proposal. The price so-stated constitutes full and complete compensation for all labor, materials, and equipment, including the TMA module, steel ba ckup, TMA support frame, hydraulic pumps, wheel jacks, the continuous repositioning thereof, the first replacement TMA cartridge, TMFAB, TMFAB support frame for attachment to the truck, generator, and all incidentals required to finish the work, complete and accepted by the Engineer. No additional payment will be made for the pr ovision of the traffic control truck. SECTION 929 FIELD OFFICES AND MATERIALS LABORATORY
929.01 DESCRIPTION. This work consists of providing and maintaining an adequate weatherproof
and ADA compliant field office or materials laboratory for the exclusive use of the Engineer and his 9−56 staff during both the contract period and approximately 180 days thereafter, all in accordance with these Specifications.
929.02 GENERAL REQUIREMENTS. 929.02.1 Location. The field office or materials laboratory shall be located on a site that is both
satisfactory to the Engineer and convenient to the project site.
929.02.2 Minimum Spatial Requirements. Unless specified otherwise in the Special Provisions of
the Contract, the Engineer's field office or materials laboratory each shall contain a minimum of 550 square feet of floor area, at least 3 rooms, and 7 feet minimum of headroom. It shall contain a sufficient number of windows to provide at least 27 square feet of natural light. Existing building structures meeting the above minimum requirements are considered acceptable.
929.02.3 Other Requirements.
a.The Contractor shall be responsible for arranging and complying with all necessary local and State regulatory permits and inspections, including all costs associated therewith.
b.The Engineer’s field office or materials laboratory shall be fully equipped, operational and ready for occupancy at least two (2) weeks prior to the start of actual construction operations.
c.The Contractor shall protect the field office and/or materials laboratory against fire, flooding, and theft throughout the 24 hours of every day the unit is in service. The Contractor shall be responsible for the loss of any property belonging to the State that is housed therein due to theft, fire, or natural causes.
d.At the time either the field office or materials laboratory is made available to the State, the Contractor shall furnish evidence to the Engineer that adequate insurance has been obtained which protects the State against loss of property from theft, fire, or natural causes. In the event of fire, theft, or equipment breakdown, all equipment involved shall be repaired or replaced by the Contractor as soon as possible. In the event the field office or materials laboratory is destroyed or rendered untenable for any reason, it shall be replaced by the Contractor within two weeks, or as directed.
929.02.4 ADA Considerations. The Department is committed to providing equal access and
opportunity for all persons in conjunction with Federal Law under Title I of the American’s with Disabilities Act (ADA). The United States Access Board defines a reasonable accommodation as; “a modification or adjustment to a job, an employment practice, or the work environment that makes it possible for a qualified individual with a disability to enjoy an equal employment opportunity.” In keeping with these directives, the Department will ensure that construction field offices will be accessible to anyone with a disability, and will also ensure that reasonable accommodation in a manner consistent with the ADA will be made to allow Department employees to be productive and efficient members of the Department’s workforce.
Source: Rhode Island Standard Specifications (Bluebook), 2024 Edition. Pages 585–588 of 826.