Why does Japan drive on the left, even though they have never been a part of the British Empire?

Question

Why does Japan drive on the left, even though they have never been a part of the British Empire?

In: 9363

Answer 1

I believe that it began not *because of* British influence, but rather for the same reason the British adopted it.
It harkens back to “ye olde sword and horseback” times.
Most riders were right hand dominant, so they would ride to the left incase they had to draw their weapon and wield it with their right hand while on the move (receiving the same in return, of course).