Residents of the Washington, D.C., metropolitan area have a number of viable public transportation options, including a subway system, buses and train service to other parts of the region. Yet, the region has some of the worst highway traffic congestion in the United States.
But every year, with the arrival of the third week in August, the pressure on the region's transportation infrastructure eases. Tourist season winds down, so the number of out-of-town visitors dwindles to a trickle. Congress is usually out of session at that time, which frees lawmakers' staffs to take time off and even take leave of the area. And many of the region's commuters are away on vacation.