At what distance can type D arrow boards be visible when mounted on vehicles?

Type D arrow boards are specifically designed for maximum visibility and effectiveness in directing traffic. When mounted on vehicles, they are capable of being seen from a distance of 1/2 mile under optimal conditions. This range allows drivers ample time to react to the instructions provided by the arrow boards, helping to ensure safety in work zones.

This visibility is influenced by factors such as the design and brightness of the board, the surrounding environment, and weather conditions. Being able to see the arrow board clearly from this distance is crucial for alerting drivers well in advance of any changes or actions they must take while approaching a work zone.