Standard traffic signs that are well maintained and properly used promote public safety and gain the respect of the traveling public.

Erect warning and regulatory signs called for in the traffic control plan (TCP) at the appropriate locations. Require the contractor to cover signs placed prior to their need, and do not leave in place longer than necessary. Require the contractor to remove or cover signs that restrict the speed limit in a construction or maintenance work zones during any period for which restricted speed limit does not apply. Discuss the timing of sign erection and removal requirements at the Preconstruction Meeting. Locations of speed zone signs will be set by the Engineer.

Erect regulatory speed limit signs in the construction zone designating the limits of the roadway section where speed reduction is necessary for the safe operation of traffic and protection of construction personnel. Install the signs only to the limits needed. Even though the entire length of the project may have an approved City/County Ordinance, reduced speed limits are in effect only within the limits between the erected speed limit signs.

Regulatory Construction Speed Zones must have an applicable Commission Minute Order. Use to request a Regulatory Construction Speed Zone.

Advisory speeds are the desirable speeds for curves, intersections, or other locations where design standards or physical conditions of the roadway restrict safe operating speeds to values less than the maximum legal speeds or posted regulatory speed limit. Advisory speed signs may be erected within a regulatory speed zone to advise drivers of a safe operating speed to negotiate roadway features. A Commission Minute Order or City Ordinance is not required for advisory speed zones. Advisory speed zones are therefore more flexible as they may be changed without revising existing Commission minutes or ordinances.

Properly maintain all traffic control devices and ensure they are legible at all times, and in conformance with the contract, the for Streets and Highways, the

Traffic Signals Manual

and American Traffic Safety Services Association (ATSSA) Quality Guidelines.

For more information on temporary traffic control for construction areas, refer to the . For information on construction speed zones, refer to the

Procedures for Establishing Speed Zones

.

Quarterly Traffic Control Inspections are to be completed by the district office in accordance with Section 4 of the .