Are stoplights triggered by time relays or traffic sensors?

Question:


Answers:

What colour are the reflectors on the slip road of a motorway?

Some lights use both.

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Why does everyone in Lake in the Hills drive under the speed limit?

Time relays

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Whats the cheapest you ever paid for a gallon of gas in your life time? i remember 39.9 cents.?

Both --depending on the light and the street it is serving. If it is a row of intersections, block after block on a main route - then they are timed. If you are cruising down an open road (more rural) and a light appears at a intersection or before a school zone or a single crosswalk that would be more traffic sensored or pedestrian controlled.

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How much is a gallon of gas where you live? Ours has sky rocketed lately!?

Sometimes one, sometimes the other, and sometimes both.

For those that ride the bus, did you ever petition for a bus route and how many signatures did you need to ?

It depends on where you are, and how up to date the system is. You can usually tell if it is on a timer if you pull up to a light and nothing happens for a few minutes. If it changes quickly then it may still be on a timer, but you just happened to pull up at the right time, but if it happens consistently then there is probably a sensor.

Where can i print a subway train?

If it won't change at all until you roll back and forward - then there is defnitely a sensor, and if it always takes forever, then it is on a timer. Some are set better than others, and some even change timing during busier times of day.

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Have you seen that truck commercial..?

Some are triggered by sensors, often in the roadway (if you seelines in the roadway in front of a traffic light there are under-the-road sensors there). Some are just on timers. A few have a radar like thing up by the light itself that sense when a car comes up to the light.

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I live in Central NY. When do you think it's time to take my winter tires off?

I believe it depends on the state/area. In Nothern VA they have traffic sensors, but in Maryland and DC - no.

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At what speed do cars get optimum gas mileage?

They use both in different places.

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