What do flashing arrow boards typically indicate?

Flashing arrow boards are primarily used to indicate a detour ahead. These boards are commonly employed in construction zones or when there is a change in the road pattern that requires drivers to take an alternate route. The flashing arrows provide clear visual cues to help direct traffic and ensure that drivers understand how to safely navigate any obstructions or modifications in the roadway.

In situations where a detour is necessary, flashing arrow boards effectively alert drivers to prepare for a change in their driving path, allowing them to respond appropriately without confusion. This is crucial in maintaining safety for both drivers and workers in construction zones. Other options, such as vehicle speed limits, construction zones, and road closures, serve different purposes and may be indicated by other types of signage or signals specifically designed for those scenarios.