395 North/South. Cops like to sit on the connector road that goes over 395 in Alexandria. Also, according to a Washington Post article, there’s a Cessna airplane flying too high to see, but he’s the eye in the sky for the cruisers. A quote from the article, "Most speeders were doing 20+ miles over the limit, they never knew we were there." Part of the "Smooth Operator" program in force now.