UPDATED: Driver Killed After Rollover Crash on Mass Pike

Update: 5:17 p.m.: 

Traffic is still largely unaffected on the Mass Pike Westbound, according to traffic.com, though exit 11a is currently closed. 

Passage is slow on I-495 south coming into the site of the crash near exit 11a.

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A driver of a tractor-trailer was killed after a rollover crash on the Massachusetts Turnpike in Hopkinton Monday afternoon, according to a scanner report. 

The crash occurred on the ramp from the Pike westbound to Route 495, according to CBS Boston.

State troopers and medical personnel responded to the crash, which was picked up by scanners around 1:30 p.m. on Monday.

Exit 11a is expected to be closed for "an extended period of time," according to the CBS Boston report.