The function of channelizing devices is to warn and alert drivers to changed conditions due to road work and to provide for smooth and gradual traffic movement from one lane to another, onto a bypass or detour, or to reduce the width of a traveled way. Channelizing devices may also be used to separate traffic from the workspace, pavement drop-offs, pedestrian paths, or opposing directions of traffic. Cones, tubular markers, drums, vertical panels and type 1 and 2 barricades may be considered as alternative channelizing devices. Not all States use all of the devices available in the MUTCD. Check with your State for approved devices. Below is a checklist of information you should know related to traffic channelizing devices.