Quote Originally Posted by Shanghai Dan View Post
I'ts not really road crown - it's the fact that left turns are ALWAYS longer than your right turn. So you end up with more "left" side wear than right... The opposite happens in countries like the UK and Thailand; in Thailand I always wore down the right side faster than the left - because we drove on the left hand side and the right turns were long compared to the left - and there was basically zero crown on the roads (one slab across).
Dan, I'm sure your right. Around here though we have highly crowned roads due to the need for highway drainage. That might also explain why left turns are easier to make at higher speeds generally.