For the next two weekends, MBTA buses will be the only vehicles allowed on the Longfellow Bridge. Boston-bound vehicles should follow this detour, while Cambridge-bound traffic should follow this detour. If you’re a cyclist, this applies to you too, as police will be on hand to ask cyclists to walk their bikes across the bridge. Pedestrians, on the other hand, can cross the bridge as they normally would. I’d also like to take this opportunity to remind you that there’s one more weekend closing in 2013, on November 23-24.

Why the complete shutdown of traffic on the bridge? In short, construction crews need to work close to the Red Line tracks, and it’s not safe to operate trains that close to workers.

As always, you can see MBTA service disruptions in real time with Service Alerts, and if you have any questions about the project, you can call the DOT’s dedicated Longfellow Bridge hotline at 617-519-9892.