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Route and Auxiliary Markers | Pennsylvania Highways
M5-1-1R - INTERSTATE ADVANCE 90 DEGREE RIGHT TURN
Interstate 90 - Wikipedia
M5-1 Advance Turn Arrow Auxiliary 90 Degree
Sign Division - Interstate, PA & US Route Markers - U.S. Municipal
Chapter 2D - MUTCD 2009 Edition - FHWA - Transportation
Interstate 90 in Ohio - Wikipedia
Chapter 2A - MUTCD 2009 Edition - FHWA - Transportation
Interstate 90 in Illinois - Wikipedia
Decode the interstates: What highway numbers actually mean