The actions, which took place during National Recovery Month, seek to propel the unionized construction industry to fight substance use disorder and help find ways for workers to improve their mental health.
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.