104.23 Protection Vehicle (Pv)
2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS CATEGORY 100 PRELIMINARY SECTION 104.23 — PROTECTION VEHICLE (PV)
104.23.01 Description
Furnish a PV as required. The PV shall consist of a work vehicle with approved flashing lights as required by the standard TCP’s and either:
a.A truck-mounted attenuator (TMA) with support structure designed for mounting the system to the work vehicle, or
b.A trailer truck-mounted attenuator (TTMA) designed for attaching the system to the work vehicle by a pintle hook. Provide an arrow panel (arrow mode for multilane roadways and caution mode on two-lane, two-way roadways) in accordance with 104.07.03. The arrow panel shall be integral to either the work vehicle or the TMA/TTMA. No part of the TMA/TTMA shall be designed to intrude under the support vehicle during impact or require a safety clearance under the support vehicle that extends forward of the rear axle. General. The ballast of the work vehicle shall meet the manufacturer’s specification for the TMA/TTMA and be firmly secured to prevent movement during an impact. All exposed steel on the attenuator shall be primed and painted yellow. The undercarriage and support frame may be primed and painted black. All welding shall be performed by or under the direct supervision of a certified welder. The rear facing surface of the TMA/TTMA shall have an inverted "V" chevron pattern formed by alternating 4 in. wide black and yellow stripes as shown in Standard No. MD 104.01-19C. The sides of the TMA/TTMA shall have a border of 4 in. red and white reflective tape as shown on Standard No. MD 104.01-18A. The TMA/TTMA shall have a standard lighting system including brake lights, tail lights, turn signals, and ICC bar lights. All wiring shall be protected and adequately supported. The TTMA trailer shall conform to Maryland Motor Vehicle Law governing trailers.
104.23 Protection Vehicle (Pv)
Impact Performance. TMA/TTMAs manufactured prior to January 1, 2005, shall have passed NCHRP Report 350 Tests 50 and 51 Level 3. TMA/TTMAs manufactured after January 1, 2005, shall have passed NCHRP Report 350 Tests 50, 51, 52, and 53 Level 3. Dimensions.
a.Road clearance for the TMA/TTMA shall be 12 in. ± 1 in. or as specified by the manufacturer.
b.Total weight of the TMA, exclusive of the work vehicle, shall not exceed 2100 lb unless it is trailer-mounted. Durability. The manufacturer shall ensure that travel vibration, in either a vertical (for TMA) or horizontal position, will not affect the performance of the work vehicle or the TMA/TTMA. Certifications. Provide certification that the TMA/TTMA is in good working order, has not been damaged, conforms to the requirements of the manufacturer’s specifications (model number, roll ahead distance, truck weight, etc.), and includes the date of manufacture. The manufacturer shall certify that moisture penetration will not impede the energy impact absorption properties or add significantly to the weight of the TMA/TTMA. Tilting. An electrically powered tilt system shall be incorporated to facilitate the tilting of the TMA cartridge to a 90 degree position from horizontal. The unit shall have a locking device to secure the TMA system in the vertical position. The completed tilt system shall be factory assembled.
104.23.02 Materials
The size of the work vehicle and the method of attachment shall be as specified in the TMA/TTMA manufacturer's specifications, and as tested according to NCHRP Report 350 and/or MASH 2016 at Test Level 3. The gross vehicle weight rating (GVWR) of the work vehicle shall be a minimum of 14 000 lb, and any fuel tank or container of hazardous materials shall be at least 10 1/2 ft from the rear of the work vehicle.
104.23.03 Construction
Not applicable.
104.23.04 Measurement and Payment
Protection Vehicle will be measured and paid for at the Contract price per unit day. A unit day will consist of any approved usage within a work shift, regardless of start time or whether the shift runs into another calendar day. Each protection vehicle will be paid for only once per unit day, regardless of how many times it may be relocated. When a protection vehicle is used for part of a 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS
104.23 Protection Vehicle (Pv)
2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS day, it will be measured and paid for as a unit day. When operations require continuous 24 hour use of a protection vehicle, the unit day will be measured as 24 hour periods from start to finish. The payment will be full compensation for the complete protection vehicle, including the truck mounted attenuator/trailer truck mounted attenuator and arrow panel, licensed work vehicle operator, unless a separate pay item has been established for the Operator, relocating the protection vehicle, and for all material, labor, equipment, tools, and incidentals necessary to complete the work.
104.24 Workers Present Trailer (Wpt)
CATEGORY 100 PRELIMINARY SECTION 104.24 — WORKERS PRESENT TRAILER (WPT)
104.24.01 Description
A Workers Present Trailer (WPT) is designed to enhance motorists’ situational awareness when entering a work zone where workers are present. When activated, a WPT will display alternating flashing YELLOW signal heads (beacons). Furnish, install, operate, and relocate a portable, self-contained, WPT with flashing beacons and ‘Work Zone - Fines Higher When Flashing’ (R2-6(5)) sign as specified or as directed.
104.24.02 Materials
Workers Present Trailer QPL Reflectorization 950.03 Sign Material 950.08 Traffic Signal Heads 950.15 Each WPT unit shall include the trailer, structural support system, sign panel assembly, lift mechanism, power supplies, trailer mounted controller, flashing beacons, communications, and ancillary equipment. All materials for the WPT shall be like new, corrosion resistant, and unaffected by water spray, salt, oil, gasoline, and all other contaminants in the quantities typically found along the edge of a traveled roadway. Construction, materials, and operation shall be in accordance with NFPA, UL, and NEC. The WPT trailer shall be painted orange and shall comply with Maryland Motor Vehicle Law. 104.24.02.01 Equipment.
a.Trailer. In accordance with Maryland Motor Vehicle Law governing trailers. (b) Structural Support. Refer to 104.19.
c.Sign Panel.
1.‘Work Zone - Fines Higher When Flashing’ (R2-6(5)) sign shall be attached to the WPT. The sign dimension shall be 48 in. wide by 60 in. high. The top portion of the sign face shall have a fluorescent orange background with black letters and border, and the lower portion of the sign face shall have a white background with black letters and border, and the sign face shall be 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS
Source: Maryland Standard Specifications for Construction and Materials, 2025 Edition. Pages 204–206 of 1,113.