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That seems like a surprising enough statement to be backed up by data. What is your source?

Everything I've read points toward larger margins of safety (longer distances, slower speeds) being safer.

See e.g. https://publications.lib.chalmers.se/records/fulltext/252480...

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American road laws are insane here. The law should be simple; you must be in the outside lane at all times unless you are overtaking, and once you're done overtaking, you should merge back into the outside lane.

https://www.highwaycodeuk.co.uk/overtaking.html

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Confusingly, the slow lane is called the "inside lane" in the UK, even though it's on the edge of the road and the fast lanes are in the middle.
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As far as I know that’s the law in every state I’ve driven in, but enforcement is pretty much nonexistent. Some states like Texas or Louisiana might have signs reminding people to stay out of the inner lanes except for passing but I’ve never heard of anyone getting a ticket over it. What’s enforcement like in the UK?

For example, the specific law in California: https://leginfo.legislature.ca.gov/faces/codes_displaySectio...

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This is dangerous nonsense. It's basically just a justification people find in order to feel good about their unsafe driving.
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