Related Clues:

• Wall and others: Abbr.
• Some map lines: Abbr.
• Flight plan info
• 1 or 66, e.g.: Abbr.
• GPS calculation
• Road map line: Abbr.
• 66, famously: Abbr.
• Houston in NYC, et al.
• OK and others
• Oft-numbered rtes.
• Road no.
• Jas.,Thos., and others
• Rural env. abbr.
• U.S. 1, for one
• Tpk., e.g.