Some multi-lane roadways feature reversible lanes, where the direction of traffic can be changed to accommodate heavy traffic moving in one direction at certain times and the opposite direction at others. For instance, traffic in the reversible lane may move toward a city center during morning rush hour but away from a city center during evening rush hour.
Traffic lights visible in both directions are installed above reversible lanes, to let drivers know whether they may use it. These signals can be interpreted using the information below.
Reversible lane control signals may also feature an electronic message board on which additional information for drivers is posted.
Freeway metering lights are sometimes used on busy stretches of limited access highway, to control the flow of vehicles entering the highway. These traffic lights are usually posted toward the end of the highway entrance ramp. A green light indicates that one car may enter the highway (unless otherwise posted), while a red light indicates that drivers must wait on the entrance ramp.
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