Question:
When your at a light and it's red is it true you have to go over a certain line to trigger the color change or is it on a cycle that does it automatically?
Answers:
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Some lights are set up on a timer. i.e. 30 seconds one way, 1:30 another. These can get complex, too, and can operate on different timers on different days or different times of day.ARCO Gas hidden .45 cent RIP OFF charge when you buy gas with ATM?
Others have a series of sensors which can detect where cars are, and if there are at least a certain amount, if not more. IF you look carefully, you can see cuts in the road material (usually in a hexagon or octagon) where the road was removed, the sensor installed, and then resurfaced. Sensors and timers often work in tandem with timed lights switching when the sensors detect a certain amount of cars in line.
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Last, some are controlled by people.
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There are also devices (which only police, ambulances, and firetrucks can legally have) that flash lights at a certain speed in a certain arragement with a certain brightness and a certain pattern that will cause lights to change and give them the right-of-way. But only newer traffic lights respond to these.
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many lights are on a timed cycle. some though are controlled by either humans in a control center for heavy traffic periods or by computer when traffic is backing up in one area or another.How will traffic congestion be in 30 years or so?
some are set up with a sensor so that when u drive over it, it will change...others are just set on a timerUsually they have a sensor.
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some residential street lights have sensors on the street but if you want them to change quicker flash your high-beams at it and they change in a snap...police cars use there flashing lights for that...just dont let one see you do that. heheHow much does it cost from Luton airport to Nottingham on the bus or train?
its on a timer..More Questions & Answers ...
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