Investigators are baffled about how the iron disc went airborne in what the governor calls an "incredibly bizarre" tragedy.
10:08, UK, Saturday 13 February 2016
A US motorist has died after a manhole cover flew through the windscreen of her car in an apparent freak accident.
Her car continued forward after the strike before hitting a wall on left lane of the southbound Interstate 93 shortly before 8am on Friday.
Massachusetts police are trying to establish what dislodged the chunky cast-iron disc.
The manhole, which was last inspected in June 2014, leads to a storm drainage system.
Massachusetts Governor Charlie Baker described it as an "incredibly bizarre" tragedy.
He said crews were now carrying out safety checks on about 500 manhole covers, grates and utility panels on highways.
The principal of Glover Elementary School said of Ms Clavette in a message: "She was a talented and valued member of our faculty."
Two lanes of the highway were closed during the investigation.