A display of our emergency vehicles

While driving along the main street of town today, I was approaching the crest of a hill. A police motorcycle crested heading in the opposite direction with its lights flashing so we all pulled over. And then another motorcycle appeared, and then a sheriff's patrol car, and another. And then there were more sheriffs cars, the mountain rescue truck, a couple of fire trucks, unmarked cars with their lights on, the local tow company, a truck that said something Disaster Center (or something like that.) I counted over 50 vehicles, all with the lights flashing. There was a bright yellow van that was labeled something about locksmiths and the people in there were waving like they were in a parade, so of course I waved back...but what the heck was that all about?! Was there a disaster preparedness convention and they just happened to break for dinner? Was it a display of where our tax dollars go? It was impressive in any case.