The MBTA is advising riders to plan for additional travel time and longer headways on the Red, Orange, Blue, Green, and Mattapan Lines this week as MBTA engineers continue to perform repair validations and speed verifications following a Department of Public Utilities (DPU) site visit last week. Riders are encouraged to use the T’s Trip Planner tool at mbta.com/trip-planner for a list of travel options, including bus routes that run parallel to subway service.