What does the flashing yellow light indicate?

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

According to the Texas Department of Transportation, a blinking yellow arrow light indicates that a driver may make a left turn but must yield to oncoming traffic. This signal differs from a steady yellow arrow light, which indicates that drivers should prepare to cease making left turns. read more

If the flashing yellow light is not at an intersection, it either calls attention to a road hazard on an accompanying sign, or indicates that a special regulation indicated on the sign is in effect (School speed limit 20 when flashing). read more

Seattle also used a 4-lamp signal at about 20 locations, with a red ball, a steady yellow ball, a flashing yellow ball, and a dual-mode yellow and green arrow; during the permissive turn, the flashing yellow ball was displayed. read more