 But if you are taking 52 or from the eastern shore, the roadway cooperates from the Beltway across the bay, three lanes to the east, two to the west, and no real surprises, all the way through Y Mills. Route 4 in Maryland, northbound out of Upper Marlboro, the northbound lanes remain closed and diverting between Dower House Road and the Suitman Parkway, Presidential Parkway, a crash investigation.