Comment by jeroenhd
I don't see it often either, but my government has been very active trying to get people to do bi-monthly tire pressure checks at the very least.
I don't think most people know how to do it, to be honest. Partially because people seem to think reading two pages in a manual is some kind of sisyphean task that no mortal should ever be cursed with.
It's pretty crazy how little people care. Even if you don't care about the safety aspect, keeping your tires inflated well saves you a ton on fuel and tire replacements.
Tire pressure management was one of the striking differences between my experiences in France and in the US.
In France, we'd check tire pressure at gas stations on nice machines that had built in dial gauges and were free.
In the US, I had to use one of those hand gauges and the air pumps needed quarters (in most cases, especially if you weren't also buying gas).
In Portugal now, the gas stations also have free air and pretty good pumps.