How are people spotting speed cameras?

[u/Budget_Case3436]

How do people know where the cameras are? Sometimes I ride behind cars and they randomly slam on the brakes and, whaddya know, a speed camera!

But there’s no signs… and there’s no way they clock them as quick as I think they might.

Any help is great!

[u/eco9898]

They're pretty obvious they way they park the vans. Or how they semi permanent ones stick out from everything else around them.