Re the hidden or visible speed cameras. We don't have either in my town, but we do have police radar. A few vehicles are probably still equipped with "fixed mounted" units, but mostly they're hand-held jobs that can be used in any vehicle - visibly marked or unmarked.

One may pick up the local newspaper, or listen to any of several radio stations to get a 24-hour notice of where the "scheduled radars" will be located for the day. The information often includes "hours of operation." Only rarely, there may be "unscheduled" radar observers randomly about in the town.

The publishing of the daily radar locations is with the complete "blessing" of the police, on grounds that being reminded daily that "they're out there" has a positive effect on the observance of speed limits by the majority of the driving population.

Almost everyone accepts that there will be those "exceptional people" who will speed regardless of what's done short of catching them in the act and assessing appropriate fines and/or other penalties. We have a lot of those here too.

John