Prepare for delays this week on Route 3 in Westmoreland County. For today and tomorrow there will be one-way, alternating traffic and after 9 a.m. on Wednesday, there will be a traffic shift onto new pavement between Flat Iron Road and Winter Harbor Road. That will allow the construction of new passing lanes over a one-and-a-half-mile long stretch.Officials say the project is on schedule for completion in December.