What does US mean on an oversize permit?

US Highway. A US numbered highway: US-287 is US Highway 287. Some lists write it with no dash (US212) or with leading zeros (US0054).

Also printed as USH.

On real permits

PrintedMeansState
US 60U.S. Route 60Arizona
US-70 WBU.S. Highway 70, westboundArkansas
US-167 SWBU.S. Highway 167, southwest-boundArkansas
US-30U.S. Route 30Idaho
I-74 E / US-51 SInterstate 74 eastbound sharing the road with US Highway 51 southboundIllinois
US-40 EastUS Highway 40, eastboundIndiana
US 69 & Garfield AveThe intersection of U.S. Highway 69 and Garfield Avenue, written as a start or end pointIowa
US-59U.S. Highway 59Kansas
US-77U.S. Highway 77Kansas
US 90 BusinessBusiness route of U.S. Highway 90 (New Orleans area)Louisiana

Decode a whole route line