What does a solid red traffic light mean?

A solid red traffic light indicates that drivers must come to a complete stop and cannot proceed through the intersection. This signal is a clear instruction aimed at ensuring safety on the roads, as it helps to control traffic flow and minimize accidents. When a red light is displayed, it is essential for vehicles to halt before the stop line, crosswalk, or intersection, allowing vehicles and pedestrians that have the right of way to pass safely.

The other choices suggest actions that are not permitted when a solid red light is displayed. For instance, proceeding with caution is appropriate for other signals but not for a red light, where stopping is mandatory. Yielding implies giving way to other traffic, which is also not the case at a solid red light. Additionally, turning left is restricted unless specifically indicated otherwise, such as when allowed by a sign at a particular intersection.