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it's well know for example that no police man will stop you on a motorway for doing 80mph.

It's possible to lose your license for driving that speed virtually anywhere in the US, even without any prior traffic violations. For example, in NC:

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The DMV can also suspend your license for the following: ... A conviction for speeding over 75 mph.


It's a local thing, then -- California has a number of freeways that have 70mph limits, and there's no way that people would put up with a suspended license for 5 over. People routinely do 80+ on those sections. Of course, people routinely do 75+ in 65 sections, too. According to the CA DMV, a suspended license isn't a possible penalty for speeding unless you were caught driving 100mph or more.