i want to create automatic sensor traffic light that sense the traffic and then get on or off pls. help?

Question

i want to create such a traffic light that sense the traffic and get automatically timed?

Answer 1

I believe we already use such sensors...

Answer 2

They already make them. I believe they use a sensor in the road that detects the traffic. After a small interlude, to make sure the traffic isn't just turning instead, it will trigger the green light to go yellow then red. Then the Red light is triggered to Green, and reasonably quickly goes back to yellow and red, unless there is traffic triggering it behind the first car. I actually know of the one intersection near where I live that has a light like this. The somewhat main road is "always" green. The other road is "always" red. Although they are both just two lane roads so not really a high traffic if you want to use that type fo thing. Another way is to use Cameras that are posted with the light. It is up off the traffic signal and would detect the traffic and the signal would change accordingly. These are also in the U.S. I'm not sure where you are but if not in the U.S. then try to contact the Deparment of Transportation to get their help. If you are in the U.S. and they just don't have these in your region then talk to the D.O.T. about having them put in.

Answer 3

They've been in use for over 30 years. It can be seen as a magnetic pick up "Small metal box", or a square of different looking pavement by the traffic light line, there is a wire loop under the pavement that detects cars. If you stand next to the traffic controll box on the pole, you can hear it click the timer on when a car pulls up. This is more commonly found where there is a traffic light at one road that is always very busy, that has an intersection with usually low traffic.

Answer 4

Two loops of wire, a known distance apart embedded in the surface of the road are often referred to as 'detector loops'. When a mass of metal goes over the first loop, a signal is *induced* in the detector and is sent to the controller (box on the side of the road). The same thing happens with the second loop. The difference in time is used by the controller to determine the 'occupancy' (or 'gap time') of the loops every cycle and the controller (or a central controlling computer) determines the appropriate green time to allocate to the lane/approach according to the 'occupancy'.

Many other vehicle detection systems exist - video, GPS, infra-red, etc. but the 'loop detector' is by far the most common. The loops are prone to breakage, however, as slow/heavy vehicles can distort the shape of the loop, leading to errors.

Answer 5

This has been done, and has been in use since the early 1960'2. They are called 'inductive loops.' They use them for traffic light signals and for many other applications including order fulfillment and security detection. The link below has oodles of stuff on them. You can also search on 'inductive loops.'