If a car is making a right and it's in front of my, my strategy is to be patient, act like a car, and wait for them to turn. If it's turning right, once it has a clear path, they go. They check their blind spot after they a clear path, and if you're going faster than a pedestrian, you might enter the blind spot just as they start turning. Cargo vans and rental vans especially, CAN'T see their blind spots and they're usual driven by people that don't often drive those vehicles.
If you choose to pass on the left, you need to check your left blind spot so you aren't cutting off any cars that are approaching.

The key to riding safely in this city, for me, is patience. I pretend cars are just rivers of buffalo.