The first system of traffic signals, which was a semaphore traffic signal, was installed as a way to replace police officer control of vehicular traffic outside the Houses of Parliament See more

Pedestrian signals are used to inform pedestrians when to cross a road. Most pedestrian signal heads will have two lights: a 'walk' light … See more

Where cycle lanes or cycle tracks exist on the approach to a signal-controlled junction, it must be considered how to incorporate cyclists safely into the junction to reduce conflict … See more

Traffic lights for public transport often use signals that are distinct from those for private traffic. They can be letters, arrows or bars of white or … See more

Variable lane control is a form of intelligent transportation systems which involve the use of lane-use control signals, typically on a See more

A set of lights, known as a signal head, may have one, two, three, or more aspects. The most common signal type has three aspects facing the oncoming traffic: red on top, amber (yellow) below, and green below that. Additional aspects may be fitted to the … See more

A variety of different control systems are used to operate signal cycles smoothly, ranging from simple clockwork mechanisms to … See more