By Rebecca Sheir
The roaring and revving of hundreds of thousands of motorcycles are expected this Memorial Day weekend around the D.C. area. An annual event commemorating military members will cause road closures over the holiday.
The annual Rolling Thunder motorcycle ride pays tribute to fallen troops, prisoners of war, and service members missing in action.
Its "Thunder Alley" event is closing off 22nd Street in Northwest D.C. between Constitution Avenue and C Street today and for most of the weekend. The stretch of road will reopen 5 p.m. Sunday.
The main Rolling Thunder rally will rumble from the Pentagon parking lots to the National Mall on Sunday, when Arlington Memorial Bridge and its sidewalks will be closed from 10 a.m. to 3:30 p.m.
Organizers say the number of cyclists and spectators in the event has grown from 2,500 in the late 1980s to an estimated 900,000 now.