 Portions of I-66 and I-95/I-395 in Virginia are HOV roads (only vehicles carrying multi-occupants or using hybrid energy are allowed on during weekday rush hours).The Washington area is served by the Washington Metro rapid transit system, operated by the Washington Metropolitan Area Transit Authority (WMATA).WMATA also operates Metrobus, a regional bus system serving D.C. and the closest immediate counties (described further below).