Related Clues:

• Hwys. with nos
• Mail carriers have them (Abbr.)
• 51-Down and others: Abbr
• Some hwys
• U.P.S. driver assignments: Abbr
• Nos. on maps
• Nos. on road atlases
• Map nos
• Itin. items
• Roads with nos
• 1 and 66, e.g
• GPS recommendations
• Delivery pathways: Abbr
• Map lines: Abbr
• Their nos. might appear on shields