More slowdowns on Route 15 in the Central Susquehanna Valley Thurway Workzone in the Winfield Area this week.  Route 15 northbound is reduced to a single lane so the contractor can reconstruct the center portion of the highway.  Wide loads over 14 feet are prohibited.  The single lane condition is expected to remain in place for most of the production season.  The southbound passing lane will also be closed during the day for the northbound construction work.  Motorists are advised to watch for construction vehicles entering and exiting the roadway there.