A flashing beacon is generally installed at an intersection or in conjunction with a warning sign in advance of an area requiring greater than normal care by the average driver. Flashing beacons serve a useful purpose where the flashing yellow is used to alert drivers to unusual conditions that are not readily apparent, such as: obstructions in the roadway, uncommon roadway conditions, narrow bridges, or unusual conditions hidden from the motorists’ view. One of the more common locations where a flasher can be used effectively is a a signalized intersection located just beyond a vertical or horizontal curve, when the intersection is hidden from the view of approaching travelers.
A red-flashing light at an intersection alert a driver to stop before entering the crosswalk on the near side of the intersection. The driver may proceed based upon the same rules applicable to making a stop at an intersection controlled by a stop sign.
A yellow flashing light indicates that a driver may proceed through the intersection with caution..
A dark traffic signal is considered to function the same way as a four-way stop controlled intersection, and a driver must stop before entering the intersection.