Speeding is not negligence and does not negate right of way. Even if he was going 60, you would still be at fault. The turn you were attempting to make was DANGEROUS, an unprotected turn onto a divided highway with a 50mph speed limit, so you should have been extra cautious. You were not. You are going to end up having to pay for the other guy's damage in the end, so it's a good thing you have plenty of money.