Keep your eyes on your mirrors, never assume approaching traffic sees you, be ready to hammer the gas and get out the way if need be. Maybe go some other way so's you don't need to turn left, come the other direction and make it a right turn. That's what I do, I never sit and wait to turn left. Reason I know that is because I was rear-ended, in a car thankfully, many years ago. Just around the block, come back, or some other route to limit exposure.