A sign with a single directional arrow indicates that you may proceed in which manner?

A sign displaying a single directional arrow clearly indicates the allowed direction for movement — you must proceed only in the direction that the arrow points. This type of sign is designed to provide straightforward guidance to drivers by indicating the proper flow of traffic at intersections or along a roadway.

The purpose of such signage is to enhance safety and efficiency by ensuring that drivers are aware of their permitted routes. Ignoring this directive could lead to traffic violations or accidents, as moving in any other direction would contradict the directional guidance provided by the sign. Thus, the presence of the arrow is crucial for maintaining order on the road and for compliance with traffic regulations.