Overturned camper blocking all lanes on I-495 in Westford

This is a file image of the Massachusetts State Police headquarters. (WLNE)

WESTFORD, Mass. (WLNE) — An overturned camper is blocking all three travel lanes on Interstate 495 northbound.

According to Massachusetts State Police, only the breakdown lane is passing northbound at Exit 83 Boston Road in Westford.

Cleanup is anticipated to take several hours.

There is major traffic delays on both sides of I-495.

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