Traffic Signals Terms

2. A large frame used to mount signals over the carriageway.
5. A condition of traffic signals where all the traffic movements are shown a red signal.
9. Phase which controls conflicting movements.
10. Period The time between the end of one stage and the start of the next stage.
12. A portion of the cycle length allocated to a specific phase at an intersection.
13. A request for right of way for traffic.
14. A period when none of the light changes.
15. A period where one or more traffic movement are allowed to go.

1. One complete sequence of the operation of traffic signal.
3. Reversion In the absence of demands the traffic signals will revert to a selected stage.
4. A group of vehicles moving together where the behavior of each upstream vehicle is influenced by the one in front.
6. The reduction in brightness of signal aspects when light levels fall below a preset threshold.
7. Split The division of available green time between stages within a signal cycle.
8. An arrangement which re lates the timings of a signal installation with the timings at a neighboring installation.
11. A metallic or thermoplastic marker used to indicate the line of pedestrian crossing.
12. A series of non-conflicting phases which run together.
16. An optical unit which when illuminated displays a color or symbol