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Questions tagged [traffic-light]

Traffic lights are coloured lights that are used to control traffic flow. They instruct traffic when it must stop (usually a red light) or may proceed, or continue to proceed (usually a green light). In some countries intermediate lights (usually amber) may also be used when changing from Stop to Go ...

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2answers
100 views

What is the starting/stopping sequence of a traffic light

As is probably known a traffic light may be turned off in which case normal rules applies to the intersection. While the traffic light is active then red & red+yellow means that drivers are ...
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1answer
65 views

What are the disadvantages of free-flow intersections?

I've recently learned about free-flow intersections. In particular, the DCMI, and the Stack interchanges. What are the disadvantages of using them, compared to the "normal" signaled intersections? do ...
3
votes
1answer
108 views

How can traffic signal controllers handle multiple conflicting preemption requests of equal priority without dropping one?

Let us assume that we are North American traffic engineers, and have the (hypothetical, plausible, yet pathological) intersection configuration depicted (not to scale and lacking lane lines, sorry -- ...
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2answers
168 views

How can a sensor detect the traffic lights? [closed]

I am working on an idea for my capstone project. I am trying to get an idea of a device, sensor or reader that can detect the front traffic light situation. so that it can tell when the light is green ...
0
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0answers
164 views

How to extend green light using NTCIP protocol?

I am working on a traffic control system using the NTCIP protocol and a ASC/3 econolite controller along with Dedicated Short Range Communication (DSRC) technology. In this technology what happens is ...
7
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1answer
1k views

How are train crossing signals and highway traffic signals coordinated?

Some roadway intersections that are near railroad tracks have signs that light up when a train is approaching. These signs warn that certain turns are not allowed because of the train. One of these ...
16
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3answers
11k views

How does a traffic light sense the proximity of vehicles?

Some traffic lights don't operate periodically but instead detect when a car is close by and then turns green. I have heard that they use a magnetic sensor embedded in the road to sense cars as they ...
25
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11answers
26k views

What are the pros and cons of a traffic circle versus a traffic light intersection?

The debate of traffic circles (also called roundabouts or rotaries) versus traffic light intersections has been in progress for a while. Those in favor of traffic circles say that, among other things, ...