What color light signals a driver to stop before the limit or crosswalk line at an intersection?

A red light signals a driver to stop before the limit line or crosswalk at an intersection. This is a critical traffic control measure, as the red light indicates that it is not safe for vehicles to proceed through the intersection. Drivers must always come to a complete stop and wait until the light changes to green before moving again. This rule is essential for maintaining order and safety on the roads, reducing the likelihood of collisions at intersections where vehicles and pedestrians may be present.

The other light colors serve different purposes: a green light indicates that it is safe to go, a yellow light warns that the light will soon turn red and drivers should prepare to stop, and a blue light is typically associated with law enforcement vehicles and does not pertain to standard traffic signals. Understanding these color signals helps drivers navigate intersections safely and comply with traffic laws.