The MBTA submitted a four-part safety plan with the Federal Transit Administration after a rash of near miss accidents and an incident that left a worker seriously injured.
An out-of-control Acura, which sped through an opening in the concrete barriers separating a work zone from highway travel lanes on Interstate-695, caused six worker fatalities.
Authorities are probing a trench collapse that killed two construction workers, who were identified by The Port Authority of New York and New Jersey as Francisco Reyes, 41, and Fernando Lagunas Pereira, 28.