What does a blinking yellow light mean?

According to the California Department of Motor Vehicles, a blinking or flashing yellow light means that drivers should proceed with caution. Unlike a blinking red light, a blinking yellow light does not require drivers to stop, but it does suggest that they slow down and remain particularly alert. read more

At an intersection, a flashing circular yellow means to take extra caution, and watch for traffic on the cross road (which has a flashing red light). A flashing red light is the same as a stop sign. A flashing yellow arrow means you ma turn in the direction of the arrow, but you must yield to conflicting traffic. read more

The flashing yellow light can go out immediately when the light turns green, or it may continue for several seconds after the intersection light has turned green, as it usually takes a line of cars some time to accelerate to cruising speed from a red light. read more