We got caught up in several miles of back-up on 495. (didn't think to have the all traffic and news station until after our last chance to exit passed) The cars were a mess. All lanes had been closed but by the time we got there 2 were opened. When we stopped for dinner, Troopers, Sheriffs, Police, and Rescue Trucks went screaming by. Later when we went over 81 the north bound traffic was an all lane parking lot.