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How long the yellow light stays yellow before turning red

Caltrans

- question from 4/2/2020 by Michael, filed under Caltrans and Traffic Laws

I would like to know how long the amber or yellow light stays amber (yellow) before turning red. Do you know the formula?

Hello,

While reading your very informative traffic school course I came across a section I have a question about. I would like to know how long the amber light stays amber before turning red. I was taught in a classroom traffic school that amber lights remain for one second for every 10 miles per hour posted for road of travel. Is this still the rule/law in California? Please get back to me. Thank you.

TrafficSchool.com Says

Hi Michael:

Thanks for reaching out and we hope you are well. Enclosed is the official requirements for time intervals for yellow lights from Caltrans' Manual on Uniform Traffic Control Devices (MUTCD), page 932. The entire manual is located here: https://dot.ca.gov/programs/traffic-operations/camutcd

It’s quite lengthy and may have some additional requirements, but the page seems to cover the formula used and speed limit examples.

According to the last chart enclosed, it looks like it’s around 1 second for every 10 MPH, more than that for lower speeds.

Hope this information is helpful and if you should have any additional questions or concerns, please let us know.

TrafficSchool.com-TVS #E1393 appreciates your business

* This question and answer may have been modified to remove any identifying personal information of the person asking the question.
** The information contained within this FAQ is up to date as of 4/2/2020. We always recommend that you get the latest information available by contacting TrafficSchool.com, the DMV, or Court directly.

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