The Massachusetts Department of Transportation is stepping up its highway inspection policies following a deadly accident involving a manhole cover.

The cover became dislodged in February, hitting a car as it drove along I-93 South in Boston.

MassDOT officials said they’re now including rigorous physical infrastructure testing that exceeds federal requirements.

Bolted down manhole covers will also be installed in some areas.

Caitlin Clavette, the driver of the car, was killed. She was an elementary school art teacher in Milton.

After the crash, MassDOT crews checked nearly 70 sites for any other safety issues, but did not find any problems.

State police are still investigating the incident. 

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