Related Clues:
- GPS line: Abbr
- One of just 12 in Alaska: Abbr
- Nos. on maps
- Road with a no
- Nos. on road atlases
- Map nos
- Bit of trip planning: Abbr
- Blvd. or rd
- GPS course: Abbr
- Driver's decision: Abbr
- Travel option: Abbr
- Letter carrier's assignment: Abbr
- Trip planner's option: Abbr
- Series of turns: Abbr
- What "I" may indicate