In California or visiting? Watch out for fake tickets.
Every motorist in California or visiting needs to know about Snitch Tickets, the fake/phishing red light camera tickets sent out by California police to bluff the registered owner into identifying the actual driver of the car. There's a lot of these fake tickets; some cities - Hayward is an example - mail out more Snitch Tickets than real tickets. Snitch Tickets have not been filed with the court, so they don't say "Notice to Appear," don't have the court's addr. and phone #, and usually say (on the back, in small letters), "Do not contact the court about this notice." Since they have NOT been filed with the court, they have no legal weight whatsoever. You can ignore a Snitch Ticket. If in doubt, Google the term. And once you understand how tricky a Snitch Ticket is, tell your friends who live in or visit California about them, so that they won't get tricked.
Also, a REAL camera ticket from ANY city in LA County can be ignored, as the LA courts do not report ignored tickets to the DMV. (This was revealed in multiple LA Times articles last summer. It is applicable ONLY to cities in LA county.)