Which of the following is a prohibited action at a red light?

Proceeding through the intersection without stopping at a red light is a prohibited action because traffic laws require that vehicles come to a complete stop when faced with a red signal. This rule is in place to ensure safety at intersections, where vehicles and pedestrians may be crossing. The purpose of stopping at a red light is to allow cross traffic and pedestrians to move safely, and failing to do so can lead to accidents and violations of traffic regulations.

The other actions are permissible under certain conditions. Making a right turn on red is allowed if there are no signs prohibiting it, as long as the driver comes to a complete stop and ensures the road is clear. Turning left after stopping is also allowed when turning from a one-way street onto another one-way street, provided the intersection is clear. Stopping for pedestrians before turning is a crucial action to ensure their safety, thus it is required and not prohibited.