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Old 07-27-2005, 01:08 PM
nitramjr nitramjr is offline
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Real Name: Ray Martin
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Default Re: Update An Old Traffic Idea

There is a HUGE difference between lights being timed for the orderly flow of traffic and drivers anticipating the changing of a light at an intersection. Lights that are timed to allow traffic to flow at a predetermined speed have a built-in safety factor so that the light on the crossing street may change a second or more before the other street shows green. This setup sequences from intersection to intersection so that as long as you are driving at the design speed, you should hit each intersection at the same approximate time in the light cycle. This creates a linear flow of traffic and also allows traffic to stop at intersections with more storage. This type of traffic signal timing design can also be used to force traffic to stop more often, controlling flow or reducing speed on a road.

What I was referring to is drivers having the ability to know exactly when the light will show green for them therefore having the ability to speed up (or slow down) in order to hit the intersection at the precise time they get the green indication. They would enter the intersection at speed and quite often would enter the intersection at exactly the same time as the clown who sped up to make it through at the end of the yellow indication. That is not good design.

There is a big difference between engineering for safety and good traffic management and engineering for convenience. Like I said earlier, I like the idea. However liking something and having it be safe are two different animals.

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