UPDATE: Collision of semis results in fire on Interstate near Ja - WKOW 27: Madison, WI Breaking News, Weather and Sports

UPDATE: Collision of semis results in fire on Interstate near Janesville

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Nancy Christofferson photo Nancy Christofferson photo

UPDATE (WKOW) -- The Wisconsin State Patrol says a semi caught fire after it rear-ended another semi, jackknifed and ran into a concrete barrier.

Troopers say it all started when a semi going north on I-39/90 was pulling into the right lane from the shoulder. A second semi could not avoid the incoming semi or stop in time and ran into the back of the first semi. That caused the second semi to turn sharply to the right, partially jackknife and collide with the right-side concrete barrier.

After the second semi stopped, its power unit caught fire, which spread to and fully engulfed the trailer.

The semi was blocking both northbound lanes and was also leaking diesel fuel, making the roadway slippery.

The State Patrol says neither driver was hurt, though one driver was taken from the scene with a non-crash related medical condition.

The first semi that was rear-ended came away with a damaged trailer, but was able to get off the road onto an on-ramp.

All northbound lanes were closed for more than three-and-a-half hours, until they reopened around 6:30 p.m. Thursday.

Troopers say charges are pending their investigation.

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UPDATE (WKOW) -- WisDOT's State Traffic Operations Center says the scene is clear after a semi fire led to a long closure of the Interstate near Janesville.

WisDOT says the fire shut down the northbound lanes for about three-and-a-half hours Thursday afternoon. 

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UPDATE (WKOW) -- As of about 5:30 p.m., WisDOT says the right lane of northbound I39/90 remains closed.

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JANESVILLE (WKOW) -- The Northbound lanes of I39/90 between Beloit and Janesville are closed following a semi fire.

The incident was reported about 2:45 p.m. at the Woodman Road overpass.

 The State Patrol recommends that northbound traffic should use exit 185B (I-43), east on I-43 to Wisconsin 140, north on 140 to US  Highway14/Wisconsin 11, west on US 14/WIS 11 to I-39/90   

Witnesses reported the cab of a semi was fully engulfed in flames by the time firefighter crews had arrived.

Backups extended more than three miles, according to the Department of Transportation.

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