What does a solid red light mean?

Answer: B — Come to a complete stop

A solid red light indicates that drivers must come to a complete stop at the intersection before the stop line, crosswalk, or intersection. This rule ensures the safety of all road users, including pedestrians and other vehicles. It is fundamental to traffic regulation, as disregarding a red light can lead to dangerous situations such as collisions. While some drivers might think they can proceed with caution or make left turns, that is only permissible under specific conditions (such as turning right on red after stopping or making left turns from the proper lane while on a one-way street). However, those actions still require stopping first when the light is red. The implication of speeding up before the light turns green is also unsafe and goes against established traffic laws. Therefore, stopping completely at a solid red light is the correct and safe action for all drivers.