What does a solid red traffic light indicate?

A solid red traffic light mandates that vehicles must come to a complete stop at the intersection or at a designated stopping point, such as a stop line or crosswalk. This rule is crucial for maintaining safety on the roads, as it prevents collisions and allows for the orderly flow of traffic.

When the light turns red, it signals to drivers that they must halt and give way to other vehicles or pedestrians that may be crossing or moving through the intersection. This regulation is in place to ensure that road users can safely navigate intersections without the risk of accidents caused by running a red light.

The other responses do not accurately reflect the requirement of a solid red light; slowing down or proceeding if the way is clear can lead to dangerous situations, while the idea of it being optional to stop is contrary to traffic regulations and undermines road safety protocols.