PennDOT District 11 is announcing a traffic shift on Route 18 (Brodhead Road) in Monaca Borough began today. Beginning at 6 a.m. on Wednesday, Route 18 traffic will be shifted into two 10-foot wide lanes on the bridge over Markeys Run between Old Brodhead Road and the railroad overpass continuously through Friday, June 21. Crews will conduct concrete patching and a latex placement on the bridge. The work is part of an $11.86 million improvement project on Route 18 between the Rochester-Monaca Bridge and the new I-376 Monaca/Shippingport interchange.  Additional work includes guiderail upgrades, drainage work, shoulder repairs, and signal updates.