What does a solid red traffic light mean?

A solid red traffic light indicates that drivers must come to a complete stop at the intersection. This rule is in place to ensure safety by preventing collisions and allowing pedestrians to cross. When the light is red, all vehicles must pause until the light changes to green. This not only helps to manage the flow of traffic but also reduces the risk of accidents when turning or proceeding through the intersection. Awareness of this signal is critical for maintaining safe driving practices.

The other options involve actions that are not permissible under a solid red light. For example, proceeding with caution or yielding to oncoming traffic would not keep in line with the requirement to stop. Similarly, the notion of preparing to turn left would not apply unless designated by an additional signal or sign, which is not the case with a standard solid red light.