To check the lights on your cars? I have already seen lots of cars with either one headlight not working at all, or way out of alignment.
When possible I do tell the driver, the other evening the car behind me had only one working headlight. We were on a country lane with no other traffic, so I stopped, put my hazards on, jumped out and ran back to tell the driver. I found a terrified looking young lady (early twenties at a guess) who seemed to think she was about to be accosted! She did eventually wind her window down, so I explained why I had stopped.
Do people still stamp their feet in anger?

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whatever next my 21 year old VW golf has no such niceties but I do check lights are still working before I venture out!
. I'm going to go out and check my lights now [if I can navigate myself around the switches. I bet cars are like washing machines in that, for all the programmes and settings you have most people only ever use a fraction of them
.In fact, I'm not even sure that I should be allowed near a washing machine either....
