891 Temporary markers are not required to be submitted for review, approval, and placement on an Approved Products List (APL). N o APL shall be maintained for temporary markers. When requested, the Contractor shall submit to the project Engineer a letter of certification from the marker manufacturer certifying that the markers supplied meet the current WVDOH Specifications.
715.41 Impact Attenuators:
All Impact Attenuators and associated components furnished shall be crashworthy when assembled, installed, and utilized in accordance with the device manufacturer’s instructions. Crashworthy shall be defined as meeting all crash testin g performance requirements of MASH at Test Level 2 or 3, as specified in the Plans. This shall include the requirement for detached elements, fragments, or other debris from the device to not penetrate or show potential for penetrating the occupant compart ment, or present undue hazard to other traffic, pedestrians, or personnel in a work zone. All Class 1, 2, and 3 approved devices, as described herein, shall be certified by the manufacturer to meet all applicable requirements contained herein. In additio n to requirements contained in the subsections below, this shall include the following:
i.The device shall perform as designed within the following parameters pertaining to the approach areas to the device. The approach areas shall include the area immediate ly adjacent to the sides of the device, an area extending fifty (50) f eet in front of the device for front approach impacts, and an area extending fifty (50) f eet to the rear of the device for rear approach impacts:
a.Maximum six (6) inch high mountable curb a minimum of eight (8) feet outside of the near face of the device when operating speeds are less than forty -five (45) MPH.
b.Maximum four (4) inch high mountable curb a minimum of thirteen (13) feet outside of the near face of the device when operating sp eeds are forty -five (45) to fifty (50) MPH.
c.No curb when operating speeds are greater than fifty (50) MPH.
d.Lateral slope 1V:10H or flatter. Lateral slope at the placement location of the device 1V:12H or flatter. ii. All components shall be designed, treated , and/or protected to insure long term durability and as -designed performance of the device in all varieties of environmental conditions expected within the State and from deterioration from UV rays. This shall include all metal components, steel cables, c onnection hardware, crushable materials and containers for such, hydraulic fluid, piston seals, etc. All steel components shall be galvanized. Except as otherwise allowed for in the herein, all Impact Attenuators furnished shall be listed on the Divisio n’s Approved Products List (APL) “Impact Attenuators – MASH”. Impact Attenuators to be furnished shall be defined in the Plans by Class, MASH Test Level, and/or Design Width as further described herein or within Sections 636 and/or 664, with these characte ristics of each device noted on the APL.
715.41.1 Class 1 Impact Attenuator: Class 1 Impact Attenuators shall be non -gating
Impact Attenuators installed on a concrete pad or bridge deck meeting the manufacturers requirements for permanent applications, or concrete pad, bridge deck, asphalt, base stone, or combination thereof meeting the manufacturers requirements for temporary or emergency applications. Class 1 Impact Attenuators shall be designed to be repairable after impacts within the parameters of those required in MASH, with a substantial portion of the device components being reusable. 892 Class 1 devices shall consist of a steel base designed to be secured using anchors, associated hardware, and adhesive if required, all of which shall be completely specified by the manufacturer. Class 1 devices shall also consist of a steel framework attac hed to the base and a mechanism using sacrificial or reusable components designed to dissipate the kinetic energy of vehicles impacting the front of the device head on. Such mechanisms shall utilize cartridges or cylinders designed to be crushed or compres sed, steel or other metal components designed to be cut or deformed, devices designed to generate high friction, hydraulic cylinders, or other similar methods. The design of the device may incorporate either proprietary or AASHTO standard versions of the c omponents described. The base and framework shall be designed to typically be reusable except for in the event of severe impacts. During head on impacts to the front of the device, Class 1 devices shall be designed to collapse rearward with the energy d issipation mechanism bringing the vehicle to a controlled stop. Except for any gating portion at the front of the device, Class 1 devices shall be designed to safely redirect front and rear approaching vehicles diverging off the roadway and impacting into the side of the device. Such vehicles shall be redirected in their original direction of travel and at a low angle of divergence from the side of the device. Class 1 devices may be designed with a built -in backup mechanism or may be required to be insta lled with the rear of the device against a solid backup structure such as a concrete block. The manufacturer shall offer and provide various transition designs and components to protect rear approaching vehicles by providing a safe transition from highway industry standard concrete barrier shapes to the rear of the device. The manufacturer shall also offer and provide transition designs and components for transitioning the device to thirty -one (31) inch height double faced w -beam and thrie beam guardrail wi th off -post splices. Any portion of the front of a Class 1 Impact Attenuator which is gating shall be no greater than three (3) f eet, measured from the nose of the device. The maximum overall length of Class 1 devices, measured from the nose of the devic e to the rear and not including any transition sections, shall be twenty (20) feet for MASH Test Level 2 devices and twenty -five (25) feet for MASH Test Level 3 devices. The manufacturer shall supply all proprietary components for complete installation of the device, including transition to thirty -one (31) inch height off -post splice double faced w -beam guardrail. Class 1 Impact Attenuators shall be designed to be repai rable by trained maintenance personnel in a reasonable time frame when subjected to impacts similar in nature to those described in the MASH criteria without requiring removal and repairs to the device off -site.
715.41.2 Class 2 Impact Attenuator: Class 2 Impact Attenuators shall be a non -gating
Impact Attenuator designed to be anchored into soil using driven or drilled support posts, and to be transitioned to thirty -one (31) inch height double faced w -beam guardrail with off -post splices without modif ication. Below grade components of Class 2 Impact Attenuators such as post sleeves and soil plates shall be reusable after impacts within the parameters of those required in MASH. Class 2 devices shall consist of support posts, a steel impact head, stee l side rails, a mechanism using sacrificial or reusable components designed to dissipate the kinetic energy of vehicles impacting the front of the device head on, and any other components required for the device such as post blockouts, post sleeves, soil p lates, tension struts, cables, etc. The kinetic energy dissipation mechanism may include those described in Section 715.41.2 or other similar methods. The design of the device may incorporate either proprietary or AASHTO standard versions of the component s described. In cases where the manufacturer offers options 893 in regard to support post material and/or post sleeves, steel posts with post sleeves shall be supplied and utilized. During head on impacts to the front of the device, Class 2 devices shall be designed to collapse rearward with the energy dissipation mechanism bringing the vehicle to a controlled stop. Except for any gating portion at the front of the device, Class 2 devices shall be designed to safely redirect front and rear approaching vehicl es diverging off the roadway and impacting into the side of the device. Such vehicles shall be redirected in their original direction of travel and at a low angle of divergence from the side of the device. The manufacturer shall supply all proprietary c omponents for complete installation of the device, including transition to thirty -one (31) inch height off -post splice double faced w -beam guardrail. Any portion of the front of a Class 2 Impact Attenuator which is gating shall be no greater than twenty (20) f eet, measured from the impact head of the device. The maximum overall length of Class 2 devices measured from the impact head of the device to the off -post splice connection with the thirty -one (31) inch height w -beam to be transitioned to shall be fifty (50) feet.
715.41.3 Class 3 Impact Attenuator: Class 3 Impact Attenuators shall be a gating Impact
Attenuator designed to be placed on various pad foundation types meeting the manufacturer’s requirements, not require anchoring, and to shield wid e objects. During head on and side impacts into the device, Class 3 devices shall be designed to collapse and capture the vehicle, bringing it to a controlled gradual stop by transfer of momentum into an expendable mass of material. Sand Barrel Clas s 3 Impact Attenuators shall be designed and provided in standard industry weights, which shall include 200 lb., 400 lb., 700 lb., 1400 lb., and 2100 lb. Sand Barrels shall be approximately thirty -six (36) inches in diameter and shall be designed to facili tate the drainage of excess sand moisture out of the sand mass. The manufacturer shall have and make available complete instructions on proper array design and layout, as well as pre -designed layouts for various operating speed and object width combination s. The manufacturer shall also provide material, weight/volume, ratio, and mixing specifications for the sand and anti - freeze agent(s) to be added to the barrels. Manufacturer specifications in regard to anti -freeze agents shall be in compliance with all a pplicable environmental laws and regulations. Class 3 Impact Attenuators shall not be supplied for permanent installations and are approved only for temporary work zone or emergency use under applicable circumstances.
715.41.4 Truck Mounted Attenuat or (TMA) and Trailer Truck Mounted Attenuator
(TTMA): TMA’s and TTMA’s shall be devices designed for attachment to the rear of a large commercial vehicle, intended to offer protection for the occupants of a work zone and to lessen the severity of a rear e nd impact for the occupants of the impacting vehicle and the commercial host vehicle. TMA’s and TTMA’s shall consist of a metal framework and shall incorporate a mechanism designed to dissipate the kinetic energy of vehicles impacting the front of the d evice head on using sacrificial or reusable component, typically cartridges or cylinders designed to be crushed or compressed, steel or other metal components designed to be cut or deformed, devices designed to generate high friction, or other similar meth ods. During head on impacts to the front of the device, TMA and TTMA devices shall be designed to collapse rearward with the energy dissipation mechanism bringing the vehicle to a controlled stop. 894 TMA’s shall be designed to be attached directly to and cantilevered off the rear of the host vehicle. TTMA’s shall incorporate an axle and shall be designed to be towed behind the host vehicle. The manufacturer shall make adequate requirements and recommendations available for necessary modifications to be made to host vehicles to adequately support the device. The manufacturer shall also make available recommended buffer distances for the device s based on expected post impact roll -ahead distances taking into consideration a variety and range of factors such as host vehicle weight, host vehicle speed, impacting vehicle speed, vertical grade, etc. TMA’s and TTMA’s shall be equipped with all nece ssary safety features required for legal highway use such as brake lights, taillights, turn signals and ICC bar lights. The front of the device shall be adequately delineated to provide high conspicuity for approaching traffic.
715.41.5 Product Submis sion and Approval: Impact Attenuator devices described in
Sections 715.41.1 through 715.41.4 to be considered for inclusion on the Division’s Impact Attenuator - MASH APL shall be submitted to the Materials Division following the current procedures specif ied in MP 106.00.02. The manufacturer should include all relevant documentation and information, including but not limited to product data sheets and bulletins, product specifications and recommendations, product manuals, engineering drawings, and any ot her requested information. Devices shall be demonstrable to be crashworthy by means specified in official guidance issued by the WVDOH.
715.42 Traffic Signal Materials and Equipment :
715.42.1 Pre-timed Fixed Cycle Traffic Signal Controllers:
715.42.1 1-Definition of Terms: Following are definitions of terms used by the
Division for pre -timed fixed cycle traffic signal controllers: Audible Pedestrian Detector: A detector, usually of the push button type installed near the roadway, capable of being operated by hand, and having audible and vibratory features for both the purposes of location of the device and notification of the operations of the device. Automa tic Reset: A reset by means of which the offset or beginning of the green is checked automatically and adjusted, if necessary, once each time cycle. Cabinet: A dustproof and weatherproof enclosure for housing the controller and associated equipment. Circuit Contact Cam Shaft: A device to operate the circuit contacts to provide the desired interval sequence. Controller: A complete electrical mechanism for controlling the operation of traffic control signals, including the timer and all necessary auxil iary apparatus mounted in a cabinet. Double Automatic Reset: A reset by means of which it is possible to automatically select any one of two automatic resets. Emergency Feature: A mercury contact bus bar relay installed in a controller, which when ener gized from a manual switch, remote point, discontinues the normal signal
Source: West Virginia Standard Specifications for Road and Bridge Construction, 2023 Edition. Pages 913–916 of 1,006.