What type of sign is used to indicate a detour?

The sign used to indicate a detour is a rectangular sign with a directional arrow. This design is essential for conveying clear instructions to drivers about alternate routes. Rectangular signs typically provide informational messages, and when paired with an arrow, they guide motorists effectively so they can navigate around construction or road closures. The directional aspect is crucial; it directs the driver along an alternate path to avoid any obstacles in the original route.

In contrast, the other types of signs mentioned serve different purposes. Circular signs, while often associated with regulatory signs like speed limits, do not typically indicate detours. Triangular signs are used for cautionary notices, advising drivers to be aware of potential hazards but not necessarily directing them. Square signs without text do not communicate specific information, thereby failing to serve the purpose of guiding drivers. The rectangular sign with a directional arrow stands out as the most effective choice for indicating a detour.