Possible Clues:

• Me.-to-Fla. route
• Me.-to-Fla. highway
• Maine-to-Florida rte
• East Coast rte
• Rte. running from Key West, FL to Port Kent, ME
• Hwy. through six Eastern state capitals
• Florida-to-Maine hwy
• Auto route from Me. to Fla.
• Maine-to-Florida rte.
• Route from Me. to Fla.