If you are not comfortable with the transition into the left lane, then your best bet would probably be the crosswalks. However, if you'd like to wait for a red light and position yourself with the left lane traffic, don't get behind the first car, be on their passenger side front light. So the driver can clearly see you. It sounds like bike-awareness is a concern, so I would put myself right out front. That way, you can also control how much space is between you and the 1st and 2nd car when you start to turn and want to turn agian onto the bike path.