[spacebanana7]

A convincing set of fake traffic lights requires a meaningful amount of time and equipment, as well as a plausible set of crossroads or roadworks.

To steel man your position though, a fake police costume would probably be just as effective at stopping vehicles arbitrarily. And despite being cheap it's a relatively rare occurrence.

[micahdeath]

Construction cones and stop signs are easy to move. *hint hint*

[tbrownaw]

I'd imagine that a fake police uniform is a bit harder to explain than an encrypted laptop and a SDR dongle?

[someguydave]

In the US it is a crime to impersonate police that most police zealously prosecute