I have to get across a few uncontrolled intersections on my bike and cagers rarely will slow down/stop to allow me to cycle through. I figured out a trick to get across quickly. I get off my bike and walk it across. Within seconds of getting off my bike, magically a cager will stop. Cagers in the other direction stop quickly as well. I have no fragging idea why cagers will stop for a "pedestrian with a bike" and not a cyclist but it works every time.
I know it sucks having to walk your bike across but it beats waiting 15 minutes for some ******* cager to stop for you, eh?