Related Clues:

• Abbr. at the bottom of a letter
• Interstate sign: Abbr.
• A.A.A. suggestion
• Hwy.
• Postal letters?
• Homophone of 42-Across: Abbr.
• Tpke.
• Road map abbr.
• Atlas abbr.
• Way to go: Abbr.
• Map abbr.
• A.A.A. recommendation
• Numbered hwy.
• Part of an itin.
• I-80, e.g.: Abbr.