Related Clues:

• 1 or 66, e.g.: Abbr.
• GPS calculation
• Road map line: Abbr.
• 66, famously: Abbr.
• Rte. with orange cones, often
• Road no.
• Rural env. abbr.
• U.S. 1, for one
• Tpk., e.g.
• Numbered rte.
• AAA map abbr.
• Map ref.
• Hgwy.
• Road-map no.
• Tpke., e.g.