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geo.stewart @ Apr 14th 2008 8:30AM
rules are set by state DOT but
"the federal guidelines state that a yellow light should be from 3-6 seconds in length, reserving higher intervals for use on approaches with higher speeds"
Notable is how frequently 1) these are not adhered to and 2) that individual lights can be inconsistent. I have seen a couple of cases where the arguments are that there have been 20% variances on the stated time by the governing body.