The Route 39 bus improvement project has been delayed another season, starting spring 2013 instead of this winter, according to MBTA spokesperson Joe Pesaturo.

The project has been repeatedly delayed. The MBTA said in September that the project was being pushed back from fall to this winter, weather permitting.

The Route 39 bus is slated to undergo several changes, including the consolidation of some stops and improved amenities like new shelters and benches and “bump-out” curb extensions. The project is meant to speed service and improve accessibility.

According Pesaturo, the project was recently approved by the City’s Public Improvement Commission, which needed to OK the curb extensions. Pesaturo said that the commission approved the extensions without any changes and that no one voiced opposition to the project at the meeting.