Sirens! I'm being overtaken by an ambulance on the way to a call. Signal, move out of the right lane onto the shoulder and stop. Traffic around me seems to be well aware today too as they are doing much the same thing.
Emergency right of way is being granted promptly until the ambulance reaches traffic stopped for a red light at an intersection. This is where the emergency response grinds to a halt as the stationary drivers don't seem to be either willing or able to get out of the way.