Route 1 closed at Harrison Street due to a serious crash January 2, 2021 Route 1 is closed in both directions at Harrison Street as emergency crews work at the scene of a serious motor vehicle crash. The southbound lanes of the state highway are also closed at Scudders Mill Road in Plainsboro. It is not clear yet how long the road will be closed. The crash happened just after 9 a.m. on Saturday. Like this: