In my experience WA and OR police make up their budgets with traffic tickets, especially from out of state drivers because those generally won't be motivated to fight in court. You will find yourself targeted especially in touristy areas ( on the OR coast for example).

Additionally, all around MSFT campuses in the old days there'd be cops waiting to catch exiting employees going 36 in a 30 (exactly 5+ over) at the end of the month to fill their quota.

There used to be a host of lawyers on the Eastside who specialized in getting rid of traffic tickets for MSFT employees on technicalities. It was cheaper than having your insurance jacked up.

I got a traffic ticket every 6 months or so in WA (all of them for 6 miles above in a residential, because I drove like an old man even when I was young). Since moving to CA, in almost two decades I've gotten exactly one for rolling a stop sign. My driving habits haven't changed.

All that to say traffic enforcement is a relied-upon income stream for some places in the US.