A mirror won't keep you from getting hit if you are stopped in the middle of the road and cars are whizzing past you. I still have no idea what your intersection actually looks like, but from what I gather, you should wait for a gap in the traffic to make the right and then the left without stopping. I would not wait in the middle of a busy 2-lane road to take a left turn. Too many idiot drivers texting, applying makeup, eating or multitasking. A thousand cars could pass you without any problem, but the 1001th could put you in the hospital or worse.