Beltway Traffic Stopped Again, This Time By Motorcycles

Never, in the 31 years that I've lived here have I seen anything like this. For the second week in a row traffic has now been stopped on the Beltway after a number of motorcyclists blocked traffic while doing tricks. I mean, I can't even believe this is a possibility! How are they doing this... just slowing down and bringing traffic to a halt so they can then take up all lanes of the loop and do tricks? Isn't there a track where this could be done? Seriously, this is unreal. Maryland State Police vow to have more patrols on the Beltway... so watch your speed!!!