A reversible lane is a managed lane in which traffic may travel in either direction, depending on certain conditions. Typically, it is meant to improve traffic flow during rush hours, by having overhead traffic lights and lighted street signs notifying drivers which lanes are open or closed to driving or turning.
The south end of Lions Gate Bridge in Vancouver, British Columbia
A turn lane (in New Zealand a "flush median") with a raised median in the forefront
Traffic lights, traffic signals, or stoplights – also known as robots in South Africa and Namibia – are signalling devices positioned at road intersections, pedestrian crossings, and other locations in order to control the flow of traffic.
An LED 50-watt traffic light in Portsmouth, United Kingdom
Traffic lights can have several additional lights for filter turns or bus lanes.
Horizontally-mounted signals in Japan
A traffic signal in Halifax, Nova Scotia, with specially shaped lights to assist people with colour blindness