History
- 1927 The route was signed from Beaver Falls to Erie
- 1928 Extended south from Beaver Falls to the West Virginia state line; also moved to its current alignment between PA 158 and Greenville from its previous alignment on current-day PA 158 near New Wilmington to Mercer and PA 58 from Mercer to Greenville.
- 1963 Moved from Liberty St., Atlantic Ave., and Washington St. in New Castle to its current alignment on Mahoning Ave. and Jefferson St.
- 1970 Widened from PA 518 in Hermitage (north end near Sharpsville) to Clark, and median installed; also, designation moved to the Beaver Valley Expressway (now Interstate 376 and PA 760) expressway between the West Middlesex interchange and the end of the Beaver Valley Expressway
- 1971 Widened and median installed from US 62 north to Highland Rd. in Hermitage (then Hickory Township)
- 1972 Widening completed from Clark to Shenango (village, near Greenville)
- 1978 Designation moved back to current alignment from the Beaver Valley Expressway designation of 1970; Business PA 18 designation through West Middlesex was eliminated
- 1997 Widened to 5 lanes from the north Beaver Valley Expressway interchange near West Middlesex to US 62 in Hermitage
- 2002 Widening completed from US 62 in Hermitage to PA 518 near Sharpsville
- 2008 Rerouted away from Geneva College in Beaver Falls to make the campus more safe for students.
Read more about this topic: Pennsylvania Route 18
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