A stricter variation is the “left lane for passing only” law, which explicitly forbids traveling in the left lane for any purpose other than passing Reserving the left lane only for passing other cars—known as “lane courtesy”—reaps surprising benefits, however Underpinning both types of statutes is the idea of not impeding the “normal and reasonable movement of traffic.”
'We've heard many of you didn't know:' sign reminds drivers the left
If people pass on the left lane, it is visually easier to see them, assuming that you are spatially aware of cars around you at all times
Passing on the left in the us is more safe than passing on the right for that reason because the left mirror is checked more often by drivers.
