There was a big thing down here in l.a. aboit them. Cant just give a ticket without having to sign for it. Do a little research on it. They cant prove you were driving so how can they give a ticket. Heres a link that will show you the process.
Plus the sign is required to be 300 feet from the intersection....This one was right at the intersection.
Do a trial by decleration first and if that doest work set up a court date. Just do your homework. At bare minimum you can get the fine reduced and do traffic school. I think you can beat the ticket thoigh.