605— Category III Traffic Control Devices

600-39 Section 605 — Category III Traffic Control Devices

605.1 Description 1 Provide, install, and maintain Category III traffic control devices . 605.2 Materials 605.2.1 Construction Signs 1 Fabricate construction signs from sign materials included on the Approved Products List For Traffic Control Devices in Work Zones that comply with Subsection 602.2.3 . 2 Permanent construction signs include regulatory, warning, and guide signs erected, installed , and maintained at the termini of a project or activity before work begins and maintained in place until the project is completed unless otherwise directed by the RCE. Consider all other signs temporary unless otherwise directed by the Department. 3 Temporary construction signs include regulatory, warning, and guide signs installed on a temporary basis when conducting work within the right -of-way. Install and maintain these temporary construction sign assemblies for various durations or different stages of a project or activity. 605.2.2 Work Zone Attenuators 605.2.2.1 General 1 Ensure that each attenuator complies with MASH or NCHRP Report 350. Use attenuators included on the Approved Products List For Traffic Control Devices in Work Zones . 605.2.2.2 Truck -Mounted Attenuators 605.2.2.2.1 General 1 Provide truck -mounted attenuators designed and constructed for controlled deceleration of an impacting vehicle and dissipation of an impacting vehicle’s kinetic energy. When struck on the approach end of the unit, provide units that decelerate an impacting vehicle to a safe and controlled stop in compliance with FHWA crashworthiness requirements. 2 Ensure that each truck complies with the attenuator manufacturer’s requirements. If the addition of supplemental weight to the vehicle as ballast is necessary, contain the material within a structure constructed of steel. Construct the steel structure wi th a minimum of four sides and a bottom to contain the ballast material in its entirety. A top is optional. Ensure that the steel structure is securely bolted to the truck's frame using an adequate number of fasteners.