Out of interest - how do the police check?
From my rather hazy understanding of tyre pressures, I'd assume that 32 psi (or whatever) would be the cold pressure. As you drive I'd expect the tyre to heat up and pressure increase. Presumably if it's an actual law then the police would have to allow the tyre to cool to ambient temperature before checking it? They would also need calibrated and certificated measuring kit. I can see this happening for HGVs (where I think they still do random roadside checks) but can't imagine them stopping a private motorist.
.
Don't know how they check, if you want to know best thing to do is ask them
Surely heat expands so a warm tyre would increase psi, therefore if a warm tyre was under inflated then a cold one would be even more so.
I surely can't be the only person that can look at a tyre and have a rough idea of whether it is under inflated ?
For the record in my job we are expected to keep the vans maintained to a certain level that keeps them road legal, and we are
subject to random spot checks by both office management and fleet manager, hopefully if checks are kept up to date there wouldn't be
any problems but TBH as in every walk of life there are those that don't.
No matter what the likelihood of these things being checked is, I would prefer to keep myself legal and that is also in
my private car, which doesn't have anything hanging from the rear view mirror or stuck to the dash, satnav is vent mounted
and I hate things swinging about in the car :banghead:
