I am also in Arizona. The unattended vans with the radar usually (or always) are preceded by a small sign on the sidewalk that the radar is in use. For example, there is often a van on Invergordon near the Phoenician. But I always seen the sign and can make sure I am not going too fast as I go by.
For police officers with radar guns and lasers, that is a different matter. But you are looking at an awful lot of money for a relatively small gain.
But you know how you drive and where so you are best positioned to make that call.
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