Arlington sits directly across the Potomac River from Washington, and its roads funnel commuters toward the bridges into the city. I-66 runs east-west through north Arlington to the Roosevelt Bridge, with rush-hour tolls inside the Beltway, and I-395, the Shirley Highway, runs past the Pentagon toward the 14th Street bridges. The George Washington Memorial Parkway follows the river, US 50, Arlington Boulevard, crosses the middle of the county, and US 29, now Langston Boulevard, runs along the north side. SR 110 links the Pentagon with Rosslyn, and Columbia Pike, Glebe Road and Wilson Boulevard are the busiest local streets.
For a mobile mechanic, Arlington's density is the main challenge. Parking is tight almost everywhere, many residential streets are zoned for permit parking, and much of the county's housing is in high-rise apartment buildings with underground garages. Traffic is heavy at rush hour on I-66, I-395, the GW Parkway and the bridges. On the other hand, distances are short, and an on-site repair saves the trouble of giving up a hard-won parking spot to drive to a shop. Building managers often require a vendor to sign in or get a temporary parking pass, so ask ahead and share the details. Some garages have clearance too low for a service van, in which case the car may need to be moved to a surface lot or the street.
Reagan National Airport sits in Arlington along the river, and its garages are common service locations for cars left during a trip. Metro's Orange and Silver lines run under the Rosslyn-Ballston corridor, and the Blue and Yellow lines serve the Pentagon, Crystal City and Pentagon City. The Pentagon, Arlington National Cemetery, Joint Base Myer-Henderson Hall and George Mason University's Arlington campus bring heavy daily traffic.