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[edit] History
- Original state highway. [2]
- Originally routed from East Palestine to Petersburg. [2]
- East Liverpool to East Palestine was unnumbered before 1931. [2]
- Petersburg to 3 miles north of Poland was route 90 before 1962. [2]
- By 1931, extended to East Liverpool along previous unnumbered road. [2]
- Extended to 1 mile north of North Kingsville along previous route 90 in 1962. [2]
- 3 miles north of Poland to Youngstown decertified in 1970. [2]
- Truncated at 3 miles north of Poland in 1970. [2]
- Youngstown to 1 mile north of North Kingsville certified as route 193 in 1970. [2]
[edit] References
- ^ Mileages retrieved from Technical Services Straight Line Diagrams unless otherwise noted.
- ^ a b c d e f g h i Route 170 by John Simpson