How long the yellow light stays yellow before turning red

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.

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** 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.