The incident happened at exit 131 on I-90 eastbound in Cambridge around 3:48 p.m. on Monday, Aug. 22, MassDOT said on Twitter.
Boston and Cambridge Fire were working to put out the flames, Massachusetts State Police said on Twitter.
Pictures and videos posted to social media show a plume of smoke rising above the truck as people drove past. The aftermath of the fire showed a massive cleanup as well.
Delays were expected as a result. No injuries were reported.
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