In traffic engineering, there are regional and national variations in traffic light operation. This may be in the standard traffic light sequence or by the use of special signals.
Swedish traffic light (left) for use by public transport vehicles only. All signals use white lighting and special symbols ("S", "–" and an arrow) to distinguish them from regular signals. The small light at the top tells the driver when the vehicle's transponder signal is received by the traffic light.
A pole-mounted four-light signal with flashing yellow arrow for a left turn in Oregon
Right turn filter arrow in Liberec, Czech Republic
A T used for the street running section of the Parramatta Light Rail, in North Parramatta, New South Wales
The normal function of traffic lights requires more than sight control and coordination to ensure that traffic and pedestrians move as smoothly and safely as possible. A variety of control systems are
Variations in traffic light operation
…Traffic light - The page about traffic lights Traffic light control and coordination Left-turn Signal Display Animation Page Archived 2013-05-17 at the Wayback Machine adapted from Evaluation of Traffic Signal Displays for Protected/Permitted…
A junction for road vehicles and pedestrians controlled by traffic lights in the UK. The various vehicle and pedestrian movements are separated in either time or space for safety and efficiency.
Computerized traffic control box
Battery backups installed in a separate cabinet from the traffic controller cabinet on the top.
Pedestrian traffic signal in Taiwan, featuring a "Walking green man" below a countdown display where the "Red Man" once stood.