But there would have to be a temperature differential of ~100F in order to see a 6 PSI change in the tires.
In the case of an accident the police check condition of tyres and pressures, they may also at there stop a vehicle at any time for a roadside safety check.
I kept my Michelin Energy Saver AS tires (195.65.15) at max sidewall pressure in all 4 tires, 44 PSI. Got nearly 70,000 miles on those tires and they wore perfectly even, they are only rated at 65,000 miles.
Usually don't bother you unless your tyre is quite visibly low (too high is hard to tell visibly) and then would probably just inform you (no ticket), but if you have a serious and/or fatal accident you can guarantee they will check your tyre pressures. If they're too high and it could be construed that they were a contibuting factor, then expect serious penalties; fine and licence points if you're lucky and prison if you're not.
I wonder if they have the science behind the "recommended" tire pressure to back up the 10% over/under requirement. Anyhow, I'm sure that you keep your tires within legal specs.