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Where I live, the temperature regularly goes well below 0F every winter. If I start my car and get into it right away, it will be at least 10 minutes before it becomes noticeably warmer.

In colder climates (e.g., further North in this State), people may leave diesel vehicles idling for hours while at work, etc., because it can be so difficult to restart them outdoors in the cold.

There's a reason people start their cars and leave them running for a while.

As far as I'm aware, cars are modified for the UK market and they're not allowed to do this - I think normally a start/stop button is added and an alarm goes off if you get out of the car with it running.

Do you feel the same about speed limits, or minimum following distance? Because cars could enforce those now.