Traffic lights control drivers and riders as well as pedestrians. They tell drivers and pedestrians when to stop and when they can go. Traffic lights for drivers and riders are illustrated on this and the opposite page. Traffic lights for pedestrians are illustrated on page 17.

In the majority of cases, as well as the main traffic lights at the 'Stop' line there are duplicate traffic lights known as secondary traffic lights. These are usually located on the opposite side of the junction (or crossing), but are sometimes placed on the same side of the junction. If the main traffic light fails, for example, a green lamp fails, then you must obey the secondary traffic light as if it were the main traffic light. Once clear of the 'Stop' line you should continue with care, without reference to the traffic lights.

Traffic Lights Traffic signs may also be used with traffic lights to qualify the meaning of the green light by banning a turning movement or instructing traffic that it must move in a certain direction.
Traffic Lights When a turn right green arrow is displayed as well as a full green light you may turn right while opposing traffic is held at a red signal. At the same time the full green signal allows the movement of traffic in other directions.
Traffic Lights If movement is allowed only in one direction, a green arrow pointing in that direction may replace the full green light. Signs are often used with these signals to indicate the necessary movement or to ban turns.
Traffic Lights At some junctions different traffic lanes may have separate traffic lights. You should only obey the traffic lights that apply to your lane or lanes.
Traffic Lights A green arrow may light up even though the red light is still showing. This means you can go in the direction shown by the arrow if it is safe to do so, whatever the other lights may be showing.
Traffic Lights When red lights are flashing alternately, all approaching vehicles must stop, until both red lights have stopped flashing. These lights are used in places where traffic is only stopped infrequently - or example at fire stations entrances.