Whenever I see a funeral procession, I think: "you must have been an A-hole in life and you just can't stop being an A-hole". Now that you're gone, you still find a way to piss me off. You were probably one of those left turn lollygaggers.
I seriously cannot find a single reason to stop traffic to let a funeral procession go through. Everyone knows where the graveyard is. And it's not like the guest of honor has any critical appointments to make. I think they can wait for everyone to stop at a light here and there.
My hot trophy girlfriend just informed me that it's all about respect for the dead. I have to argue that respect for the dead was a lot easier before rush hour existed, therefore: