What indicates the start of a one-way street?

A sign that clearly states "One Way" along with an arrow indicates the start of a one-way street. This sign is crucial for drivers as it informs them that they must proceed in the direction indicated by the arrow and that they should not attempt to enter the street from the opposite direction. It helps to maintain order on the roads by preventing potential accidents that could occur if vehicles were to travel against traffic.

Other options, such as a speed limit sign, a traffic light, or a pedestrian crossing sign, serve different purposes in traffic management. Speed limit signs dictate the maximum allowable speed in a given area, traffic lights control the right-of-way at intersections, and pedestrian crossing signs alert drivers to areas where pedestrians may be crossing the street. None of these options specifically indicate the traffic flow direction associated with a one-way street.