Give an example of a channelizing device.

A channelizing device is used in traffic control to guide, direct, or restrict the movement of traffic within work zones, ensuring safety for both road users and workers. The correct answer, cones or barricades, exemplifies an effective channelizing device as they physically delineate lanes, provide guidance on safe navigation around obstacles, and indicate where driving should or should not occur. Their design allows for temporary setups and easy transport, making them particularly useful in fluctuating work zone conditions.

Stop signs and traffic lights serve different primary functions; they are regulatory devices meant to stop traffic or control flow at intersections rather than channelize it. Arrow boards are also traffic control devices, more suited for providing directional guidance to drivers but do not physically channelize traffic like cones and barricades do. Thus, while all these choices serve essential roles in traffic management, cones and barricades are specifically designed for channelizing movement within work zones.