Devices used to channel traffic include cones, delineators, drums, vertical panels and barricades. Lane closings should begin far enough in advance of the work zone to allow drivers to move gradually to a new lane. Traffic is tapered, or narrowed, and re-directed into another lane. Flaggers also warn and direct drivers. Isolating the Work Zone Cones, drums and similar types of markers will not keep a car or truck from hitting workers.
Concrete barriers are a good way to prevent vehicles from straying into a work zone.
Other ways to decrease the chances of getting struck are to place objects that will absorb a collision between traffic and workers. Figure 7 Lighting and Protective Clothing Make sure workers are as easy to see as possible. Workers should wear a bright orange vest or jacket. For night-time work, the vest or jacket should reflect light. Work zones should be well lighted if work is done in the dark.