Editing Ramp meter (section)

== Enforcement ==
On some ramp meters, there is a singular red light on the backside of the signal that is synchronized with the red light on the traffic signal that the drivers see when queueing. When the queueing drivers see the red light on the traffic signal, the backside red light is on, when the traffic signal displays green or yellow, the backside red light is off. This allows [[highway patrol]] to enforce the metering lights by having an [[Police officer|officer]] park their [[Police car|car]] or [[Police motorcycle|motorcycle]] on the [[Shoulder (road)|shoulder]] a short distance past the targeted signal, watch the red light for any offenders, and pull them over. Additionally, if the given ramp has a carpool bypass lane, officers from that vantage point may also catch and pull over non-carpoolers who are illegally using the carpool lane to skip past the ramp meter queue.
On westbound [[I-80 in California|I-80]] in [[Oakland, California]] just past the [[San Francisco–Oakland Bay Bridge|Bay Bridge]] toll plaza, there is a section with overhead metering lights that cycle when the freeway traffic volumes are high, equipped with [[Red light camera|cameras]] that capture license plate images of drivers who run the red light and then send a fine. 
{{See also|Red light camera}}