Are stoplights triggered by time relays or traffic sensors?

Answer 1

Some lights use both.

Answer 2

Sometimes one, sometimes the other, and sometimes both.

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.

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.

Answer 3

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.

Answer 4

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.

Answer 5

Justin is authentic yet i'm going to upload those electric lines buried interior the line emit a magnetic container and while the steel of a vehicle passes above it, it slightly adjustments that magnetic container and sensors experience that adjust and alter the lighting fixtures furniture

Answer 6

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

Answer 7

Time relays

Answer 8

They use both in different places.