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PennDOT road crews have started work to repair a sinkhole along Route 422 at the east end of Derry Township.

PennDOT crews will first excavate and determine the size of the sinkhole. Depending on the size, the repair work may take most of the day to complete, according to a PennDOT news release.

The repair work is affecting both directions of Route 422, and a traffic signal at the intersection of East Derry Road has been placed on flash. Flaggers are assisting drivers through the work area.

Drivers are advised to seek alternate routes or allow additional time in their travel plans in order to avoid delays.

The work was originally scheduled for Monday, but was postponed because of rain.