Tilted Forum Project Discussion Community - View Single Post - Is there a standard for the length of a yellow traffic light?

sblime42 · 11-20-2005, 08:43 PM

Actually, I believe California law requires yellow lights to be at least 4 seconds long. I'll see if I can dig up a citation for you.

*edit* this is what I've found so far:

http://www.dmv.ca.gov/pubs/vctop/d11/vc21455_7.htm

Seems it may just apply for lights that have cameras. I'll keep looking.

Ok this is what I've found:

Table 4D-102 Minimum Yellow Light Change Interval

Posted Speed or Prima Facie Speed Minimum Yellow Interval
MPH / SECONDS
25 or less / 3.0
30 / 3.2
35 / 3.6
40 / 3.9
45 / 4.3
50 / 4.7
55 / 5.0
60 / 5.4
65 / 5.8

Seems they are related to how fast the posted speed is. Again, these supposedly only apply to lights with cameras on them. I do not believe this law applies to regular lights.

11-20-2005, 08:43 PM	#14 (permalink)
sblime42 Upright Location: look up	Actually, I believe California law requires yellow lights to be at least 4 seconds long. I'll see if I can dig up a citation for you. edit this is what I've found so far: http://www.dmv.ca.gov/pubs/vctop/d11/vc21455_7.htm Seems it may just apply for lights that have cameras. I'll keep looking. Ok this is what I've found: Table 4D-102 Minimum Yellow Light Change Interval Posted Speed or Prima Facie Speed Minimum Yellow Interval MPH / SECONDS 25 or less / 3.0 30 / 3.2 35 / 3.6 40 / 3.9 45 / 4.3 50 / 4.7 55 / 5.0 60 / 5.4 65 / 5.8 Seems they are related to how fast the posted speed is. Again, these supposedly only apply to lights with cameras on them. I do not believe this law applies to regular lights. Last edited by sblime42; 11-20-2005 at 09:03 PM..