Trailer Attenuator (TA)
Article 1 — Description
Furnish, operate, maintain, and remove upon completion of work, a truck -mounted attenuator (TMA) or trailer attenuator (TA).
Article 2 — Materials
Furnish, operate, and maintain new or used TMAs or TAs. Assure used attenuators are in good working condition and are approved for use. A list of approved TMA and TA units can be found on the Department’s Compliant Work Zone Traffic Control Devices List. The host vehicle for the TMA and TA must weigh at least 19,000 lb. Host vehicles may be ballasted to achieve the required weight. Any weight added to the host vehicle must be properly attached to or contained within the vehicle so that the weight does not present a hazard and that proper energy dissipation occurs if the attenuator is impacted from behind. The weight of a TA will not be considered in the weight of the host vehicle, but the weight of a TMA may be included in the weight of the host vehicle. Upon request, provide either a manufacturer’s curb weight or a certified scale weight ticket to the Engineer.
Article 3 — Construction
Place or relocate TMAs or TAs as shown on the plans or as directed. The plans show the number of TMAs or TAs required, the number of days or hours, and for which construction phases.
Article 4 — Measurement
4.1 Truck -Mounted Attenuator or Trailer Attenuator (Stationary) . This Item will be measured by the day.
TMAs or TAs must be set up in a work area and operational before a calendar day can be considered measurable. A day will be measured for each TMA or TA set up and operational on the worksite.
4.2 Truck -Mounted Attenuator or Trailer Attenuator (Mobile Operation) . This Item will be measured by the
hour or by the day. The time begins once the TMA or TA is ready for operation at the predetermined site and stops when notified by the Engineer. When measurement by the hour is specified, at least 4 hr. will be paid each day for each operating TMA or TA used in a mobile operation. When measurement by the day is specified, a day will be measured for each TMA or TA set up and operational on the worksite.
Article 5 — Payment
The work performed and materials furnished in accordance with this Item and measured as provided under “Measurement” will be paid for at the unit price bid for “Truck -Mounted Attenuators/Trailer Attenuators (Stationary)” or “Truck -Mounted Attenuators/Trailer Attenuators (Mobile Operation).” This price is full compensation for furnishing TMA or TA; setup; relocating; removing; operating; fuel; and equipment, materials, tools, labor, and incidentals. Reimbursement for the repair of damaged devices will be in accordance with Section 7.17.1., “Reimbursable Repair.”