MARLBORO (CBS) – Three separate truck and tractor-trailer crashes on Interstate 495 caused residual delays during the Wednesday morning commute.

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Just after midnight a pickup truck that was towing a livestock trailer crashed on the Tewksbury-Andover line.

The trailer was reportedly on its side, but no injuries were reported.

Later in the overnight hours, a tractor-trailer flipped on the northbound side of I-495, blocking two lanes at Exit 24.

The truck has since been righted, but cleanup efforts are expected to take several hours, impacting the morning commute.

Another tractor-trailer jackknifed on I-495 southbound, blocking most of the travel lanes.

Heavy traffic delays resulted from the accident.