What does a solid red traffic light mean?

Answer: B — Stop and do not proceed until the light turns green

A solid red traffic light means that a driver must come to a complete stop and remain stopped until the light turns green. This signal indicates that it is unsafe to proceed through the intersection, and obeying this traffic rule is crucial for the safety of all road users. Stopping at a red light helps prevent accidents by ensuring that vehicles do not enter an intersection while cross traffic has the right of way. The other options do not accurately reflect the meaning of a solid red light. Yielding to oncoming traffic would imply that it is acceptable to move forward into the intersection, which is not permitted. Proceeding with caution suggests that it is safe to continue through the light despite it being red, which contradicts the requirement to stop. Waiting for a pedestrian signal pertains specifically to situations where pedestrians are present, and is not relevant when addressing the meaning of a solid red light for vehicles. Thus, stopping at a solid red light is a fundamental rule that ensures safety at intersections.