Electronics > Beginners

Traffic light circuit with 556 timer?

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Ed.Kloonk:
In my part of the ant hill, many peeps run red lights -because- often most drivers aren't ready to go anyway.

phennessey:
If you know exactly when the light will change, you will be encouraged to not slow down as you approach a red light and try to time your entry into the intersection precisely when the light changes. Meanwhile, a car may be trying to get through the light before it turns red. Bad combination.

I don’t have data, sorry! It just seems like a bad idea to give people advance notice when a light will turn green, which is why the US doesn’t employ that system. I can’t believe it would be safer with that feature, but I welcome any data that proves me wrong.

Ed.Kloonk:

--- Quote from: phennessey on December 27, 2019, 03:40:33 am ---If you know exactly when the light will change, you will be encouraged to not slow down as you approach a red light and try to time your entry into the intersection precisely when the light changes. Meanwhile, a car may be trying to get through the light before it turns red. Bad combination.

I don’t have data, sorry! It just seems like a bad idea to give people advance notice when a light will turn green, which is why the US doesn’t employ that system. I can’t believe it would be safer with that feature, but I welcome any data that proves me wrong.

--- End quote ---

Sometime in our near future, you're forgetting, all traffic light sets will have cameras. It used to be that bad intersections received a camera. Now, at the least, the road triggering infrastructure is being built into the roads with every new set. If the red light runners are indeed as bad as you say, my information suggests that revenue from tickets will pay for a camera installation at every turn.

james_s:
I would support red light cameras if they were about improving safety but unfortunately they end up being purely for revenue. Multiple municipalities have been caught turning down the amber light intervals and data has shown rear end accidents to increase at camera equipped intersections. In a city near me there was an attempt to put forward a citizen initiative banning red light cameras and it got shot down early in the process with an official quoting that they need the revenue.

james_s:

--- Quote from: phennessey on December 27, 2019, 03:40:33 am ---If you know exactly when the light will change, you will be encouraged to not slow down as you approach a red light and try to time your entry into the intersection precisely when the light changes. Meanwhile, a car may be trying to get through the light before it turns red. Bad combination.

I don’t have data, sorry! It just seems like a bad idea to give people advance notice when a light will turn green, which is why the US doesn’t employ that system. I can’t believe it would be safer with that feature, but I welcome any data that proves me wrong.

--- End quote ---

Sorry but if you don't have data then it is just baseless speculation and of no value, it makes me suspect you have never driven anywhere that has this feature. All it does it illuminate the amber light for a brief period just before it turns green, it gives you just enough of a warning to have time to put the car in gear, it's very convenient and doesn't cause the problems you believe it does. You still look both ways to verify that traffic has stopped on the cross street before proceeding, just like you (hopefully) do anywhere else.

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