I'm Lucy, and I'd be happy to answer your questions today. I'm sorry to hear that this happened.
There's a long-standing myth that red light camera tickets in California are optional and that people can ignore them without consequence. While the city of Los Angeles stopped enforcing these tickets back in 2011, Beverly Hills was not part of that decision. They've actually been adding more cameras since 2015. So it's important to know that you do have to deal with the ticket to avoid having it sent to collections.
There should be paperwork with the ticket that allows you to submit a Trial by Affidavit, explaining that the light was yellow when you went through it and that you should not have to pay. It is necessary to submit full payment with that request, though. If you lose the trial by affidavit, you can request a full trial. With that said, the cameras are set to only go off if the light is red, and police officers review them before sending them out. It might be better to go to the courthouse on the date on the ticket and ask the district attorney to explain to you where you were when the light changed. They know how to read the pictures. If you still think the light was yellow, you can request a trial and make them prove it.
California law does allow a person to go to traffic school once every 18 months to have a violation removed from their record. This request must be made before paying the ticket. Red light camera tickets are usually a good time to exercise this ability, if possible, because it's one of the few types of violations where the DA won't negotiate to reduce the fine. So if you haven't been to school yet, consider whether you are able to pay the ticket and take an online course to keep the ticket from increasing your insurance (that's assuming the DA can prove that you ran the light).
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