I passed two thousand motorcycles

As promised, here is the motorcycle story. I was driving on Route 17 in New York on an uneventful morning  when I say a herd of police cars. They were directing all the traffic to the left lane. On the right lane, there was a parade, two abreast, of motorcycles. They were men, women, young, old, I even saw Santa at one point. I started to pass them and over the next half hour I must have past two thousand motorcycles. At the head of the pack was a state police car, keeping them in line and under the speed limit.

I have no idea who they were or why they were there. I guess motorcycles like to travel in packs. Must be fun.