On multilane roads, if traffic volumes permit, close the lane adjacent to the dropoff. Construct a wedge of material to fill the dropoff. Under emergency conditions where a shallow vertical surface cannot be sloped prior to opening the lane to traffic, traffic control markers should be erected at close intervals along with warning signs. Install a traffic barrier. Make sure to evaluate any hazard the barrier may create.
Small cars are at greater risk than other vehicles when impacting a safety-shaped concrete barrier.
The need for a full shoulder for stalled vehicles or emergency operations of police, fire, and EMS personnel must be evaluated. When work zone traffic control is installed there should be provisions for on-site monitoring to assure the devices are functioning day and night, seven days a week. The monitoring should involve the aid of the police and other agency personnel. Complete records of the management of the TCP should be maintained by both the contractor and agency personnel.