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What's with those people?
(sh.itjust.works)
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The rules are simple:
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This depends on the country/state, the speed limit of the road, and possibly other local laws.
Broadly speaking, in the US on roads with speed limits at or above 55mph: the laws for many states require keeping right except to pass. [Generally] On roads under 55mph: there is no such rule but it's not uncommon for people to think there is, probably due to confusion with the 55+ law, or perhaps there's a different state or local law where they live.
99.9% of people don't look up differing traffic laws before driving through multiple states, which is why most differences are posted with road signage.
EDIT: An obvious exception to the speed limit rule are interstate highways where the speed limit will drop in urban areas but still require to keep right except to pass.