A tractor-trailer jackknifed on Route 22, causing heavy traffic backups in Dauphin County Friday afternoon, officials said.
The crash happened around 12 p.m. in the westbound lanes near the Mountain Road exit (Route 325), according to PennDOT spokeswoman Fritzi Schreffler.
Schreffler said the left lane is closed due to center concrete barrier damages from the tractor-trailer along with a fuel spill and debris…