How do stoplights detect a car?

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Answers:

How do I take my shift knob off in my Jeep Liberty?

Usually, there's a sensor that senses when a large metal object has passed over it. Things like an engine block. That's why motorcycles, not having much metal, can be stuck at lights cuz they can't trip that sensor.

What is the cost of Land cruiser?

If they have two sensors, they can figure out your speed (how red light or speed cameras usually work).

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What exactly does a programmer do for a truck?

They usually bury a metal sensitive wire in the lanes going into the intersection. If you look at the street, you can see the patches ove the cuts in the asphalt.
These wires sense a car over them and start the "change" sequence after a timer runs it's course

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The big round antenna on the roof of the RCMP cars about 4 inches wide, any1 know what this is for?

They have two different sensors used. There is a ground sensor that detects the wheels and the weight of the vehicle. Also most of the signals have a eye sensor that when it gets late at night and the traffic signal is set to only respond to change when traffic comes upon the lesser of the traveled of the intersecting roads.These sensor eyes are light affected.So when you get close up on it your head lights are detected on the eye and put the signal into a 30 second cycle to change from red to green after giving the apposing signal the yellow warning.

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Does any know if there is an atlas that shows roads from the past and current roads?

There are three ways that I know of:
1.Under the pavement is a magnetic sensor that picks up the metal in your car and starts it working.
2.Some are pressure sensors that pick up the weight of your car. That's why motorcycles and bicycles have a problem making lights change.
3. Infrared sensors on top of the light are sent signals by police cars, fire trucks and in some places buses that will activate the light, just like your TV remote. So there....

Car InSuRaNcE!!!!!?

P.S. If someone is stopped too far back from the light and not far enough over the sensor, honk and make them move up!

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