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Traffic signals are instruments for controlling traffic by using changing lights. They are used for controlling traffic.
UK light cycle[change | change source]
The order the lights change in the UK are as follows:
- 1 Red Light On
- 2 Red and Amber on
- 3 Red and Amber off
- 4 Green Light on
- 5 Green Light off
- 6 Amber Light on
After this, the process is repeated. The meaning of each signal is as follows:
- 1 Red = ‘Stop’. Wait behind the stop line on the carriageway.
- 2 Red & Amber = 'Stop'. Do not pass the stop line until GREEN shows.
- 3 Amber = ‘Stop’ at the stop line. You may go on only if the AMBER appears after you have crossed the stop line or are so close to it that to pull up might cause an accident.
- 4 Green = ‘Go’ means traffic may go on if the way is clear. They should take special care if they intend to turn left or right and should give way to pedestrians who are crossing. Look for filter lights (with arrows) which may and have a different timing to the rest of the light sequence.
Morgan's traffic signal[change | change source]
Garrett A. Morgan is credited with the following:
- The first automatic traffic light (Some disagree with this and claim there was a hand crank in the back)
- The first to patent the traffic light (Again, some disagree.)
- The inventor of the basis for our modern day traffic light.
William Potts was a police officer who invented a (maybe the first) traffic light. Being a government official, he was not able to patent it.