That picture looks oddly familiar. I've had a couple of those in the past, mostly in PG County from the mobile speed traps they set up.
There are a few work zones in DC that have cameras. They're cleverly hidden. Fortunately I realized it at the last second and slammed on the brakes. That might be the 35 MPH ticket you got.
I've yet to encounter a speed camera in SF. But we do have lots of red light cameras.
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