Traffic Control Device timing

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Traffic Control Device timing

by: hwybear on
Mon Jan 03, 2011 7:09 pm

Keep hearing I can't stop, not enough time etc... Interesting is the Minimum times.....I have yet to see any light at that little of time, the lights where I live all have 4 sec amber and 2 sec all red.

This is a suggested way on how to set up traffic control device timing - I will post below, but here is link ... aining.pdf
Timing - Minimum Interval Timing

LIGHT - desirable minimum seconds - acceptable minimum seconds
- amber 2.0 seconds - 1.5 seconds
- all red 1.0 second - 1.0 second

Calculation of clearance interval (amber interval clearance and all-red interval clearance) is based on approach operating
speed, the motorists perception and reaction times, the crossing width and the average deceleration rate of the vehicles
clearance = Amber + All-Red
Amber indicates to the driver that the right-of-way is about to be changed and therefore must provide sufficient time for the
approaching motorist to travel the Stopping Sight Distance

The all-red interval represents the time required to provide a safe passage across the intersection for vehicles entering the
intersection at or near the end of the amber interval.
Above is merely a suggestion/thought and in no way constitutes legal advice or views of my employer.
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Radar Identified
Posts: 2881
Joined: Mon Sep 08, 2008 8:26 pm
Location: Toronto


by: Radar Identified on
Tue Jan 04, 2011 10:13 am

Historical note... the person who "invented" the amber light (actually, the three-colour traffic signal) was a cop: William Potts, of the Detroit Police.
* The above is NOT legal advice. By acting on anything I have said, you assume responsibility for any outcome and consequences. * OR
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