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  1. Route and Auxiliary Markers | Pennsylvania Highways

  2. M5-1-1R - INTERSTATE ADVANCE 90 DEGREE RIGHT TURN

  3. Interstate 90 - Wikipedia

  4. M5-1 Advance Turn Arrow Auxiliary 90 Degree

  5. Sign Division - Interstate, PA & US Route Markers - U.S. Municipal

  6. Chapter 2D - MUTCD 2009 Edition - FHWA - Transportation

  7. Interstate 90 in Ohio - Wikipedia

  8. Chapter 2A - MUTCD 2009 Edition - FHWA - Transportation

  9. Interstate 90 in Illinois - Wikipedia

  10. Decode the interstates: What highway numbers actually mean