"driving" in the left lane. YES it's illegal.

hornet28 wrote:
Look here for a map showing the law for states

https://jalopnik.com/left-lane-passing-laws-a-state-by-state-map-5501615

Clicky

I notice that the list is nine years old. In the case of at least one state--Michigan--the law has changed to "left lane for passing only".