HAVERHILL — The traffic backup on Interstate 495 north is over, after vehicles were backed up for more than a mile Wednesday morning.

A driver who fell asleep at the wheel crashed into a parked state police cruiser on I-495 north just north of the Ward Hill Connector, resulting in a trooper being taken to Lawrence General Hospital with minor injuries, police said.

The driver of the other vehicle was uninjured, police said.

The crash happened about 9:30 a.m and caused a traffic jam, backing up vehicles all the way back to Lawrence.

Police said the cruiser was parked next to the high-speed lane where the state is building a temporary bridge as part of a project to repair a highway bridge with structural problems in Haverhill.

After the crash, state police closed part of the highway to traffic, causing the backup.

The disabled car was in the lane where concrete barriers at the edge of the highway separate the road from the bridge construction site.

Just before 10 a.m., traffic was backed up from the site of the crash to I-495 north exits in Lawrence.

As of 11 a.m., the crash scene had been cleared and traffic was returning to normal, police said.

A complete report will appear in Thursday's print edition of The Eagle-Tribune and online at eagletribune.com.

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