Emergency crews shut down a busy part of the Massachusetts Turnpike on Friday to avoid the risk of “a major sinkhole,” State Highway Administrator Jonathan Gulliver said.

The westbound lanes of the Massachusetts Turnpike between Hopkinton and Westborough were shut down due to a possible sinkhole, MassDOT said Friday. At around 7 a.m., a contract worker noticed “unusual pavement cracking” adjacent to an embankment,

The westbound side of the Mass Pike is closed at the Route 495 interchange in Hopkinton after a large crack was seen in the highway. Drivers should expect traffic delays as crews make emergency repairs to the road,