The law requires posted signs at no less than 300ft be posted indicating of photo radar. Those vans gamble you don't know this, as if you do and bring that information to court... they have to dismiss the ticket. The law also states that if you don't recognize the ticket, they have to serve you in 90days or it's dismissed. As a scare tactic, they put on the ticket that if you don't comply you could possibly lose your license, pay extra fees for having to serve you... blah blah.
What pisses me off the most, are the photo radar camera's, as most of you know, is owned by a 3rd party company! Banking in agreements with police for tickets paid. I've received 2 of these tickets, one on the famous 101 in scottsdale doing 76mph and another right near my home from those vans.
I ignored the scottsdale one, never got served. That was over 180days ago after I received it in the mail.
The van one never came, that was over 60days ago. Might have had something to do with me going back to the van, and confronting the employee working the van, calling him on the spot and calling him a hack and pathetic addition to life.
He decided to move to another location shortly after that.