Related Clues:
- Most letters in D.C.
- Rtes.
- Ave. crossers
- Peter, Paul and Mary: Abbr.
- Byways: Abbr.
- Abbr. concerning the holy or 'potholy'
- Country rtes.
- Patrick and Paul: Abbr.
- They're numbered in NYC
- D and C, in D.C.
- Peter, Patrick and Paul: Abbr.
- Parts of forks: Abbr.
- Bases for some IRT stop names
- Block boundaries: Abbr.
- Some are numbered in NYC