What does a solid red traffic signal indicate to drivers?

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

A solid red traffic signal indicates that drivers must stop and not proceed until the light turns green. This signal is a critical part of traffic control, ensuring that vehicles and pedestrians can safely navigate intersections without the risk of collisions. When the light is red, it is the driver's responsibility to come to a complete stop at the designated stop line, crosswalk, or intersection. The solid red light's purpose is to clearly communicate to drivers when it is unsafe to continue driving. This helps maintain order on the road, especially at busy intersections where multiple vehicles and pedestrians might be present. Understanding and obeying traffic signals like the solid red light is essential for the safety of all road users.