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.
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.