ROANOKE CO., Va. -

Both southbound lanes have reopened on Interstate 81 in Roanoke County after an accident involving four vehicles caused major traffic backups.

The lanes reopened around 7:45 p.m. Friday.

The detour is no longer in place.

A state trooper was working a minor accident on the right shoulder of the interstate at exit 132 when the driver of a Toyota 4 Runner failed to slow down.

Three approaching vehicles had slowed when the 4 Runner rear ended the third car in line, hit the second, and flipped and hit another car before landing on the right passenger side.

The passenger in the 4 runner was injured.

No one else was hurt in the accident, according to state police.

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An accident involving four vehicles has shut down the southbound lanes of Interstate 81 in Roanoke County.

Traffic backups are about 7 miles as of 8:14 p.m. Friday, according to Virginia Department of Transportation.

Police tell us that a state trooper was working a nearby accident when the driver of a Toyota 4 Runner failed to slow down properly.

The 4 Runner crashed into another vehicle, causing a chain reaction.

The passenger in the 4 runner was injured. No other injuries have been reported at this time.

Drivers should expect major delays in the area.

According to VDOT, traffic is being detoured off the interstate at Exit 137 in Salem onto Route 460.

We're told there is no estimate for when the southbound lanes will reopen.

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The Virginia Department of Transportation says there is a multi-vehicle wreck in the southbound lanes of Interstate 81 at mile marker 133.

That's just before the Dixie Caverns exit.

VDOT says the left and right lanes are closed.

To avoid the issue, drivers should take Route 460 through Salem and the Glenvar area and get back on I-81 at the Dixie Caverns exit.

Check back soon for more details.