Riding on the left side comes from horse riding (carriages). A man would have his sword (hilt) on the left side of the body to be drawn with the right hand towards the right side of the body. If you would be riding on the right side of the road, you would be drawing your sword towards the pavement (side walk) rather than towards your enemy on your right hand side.
Since then, riding on the left just didn’t change for some countries.
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