One of the most important components of work-zone traffic control is delineation of the edge of the traveled way, a function that is often fulfilled using channelization devices. Work-zone channelization devices provide critical information about an upcoming taper area, lane closure, lane shift, narrowing of the traveled way, separation of opposing traffic or other required maneuver related to the work zone. Such devices are particularly important in assisting drivers with tasks such as lane selection, lateral positioning within a particular lane and speed control. Due to the dynamic nature of work zones, channelization is typically provided by lightweight and easily movable temporary traffic-control devices, including drums, cones, vertical panels or barricades.
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