Originally Posted by
MikeyMK
In Britain it's left. The reason we keep to the left is because most knights on horseback were right-handed, so their swords were on their left. Passing on the left meant there was no risk of clashing swords with on-coming knights.
That's why our motor vehicles have the steering wheel on the right.
I have no idea why you guys do it reversed.
I was going to say because some dude in charge at the time said so. Then I looked it up and found I wasn't too far off. Turns out, it was a "thumbing nose" gesture to everything English after America gained its independence.
The Brits got back by giving us their accused sloppy seconds, Imperial system of measurements. Something they discarded long ago. Take that America.