FORT WORTH (CBSDFW.COM) – Traffic on Highway 287 and Loop 820 in Fort Worth was backed up for miles Friday after an 18-wheeler carrying lumber crashed off a connector bridge.

The accident happened around 8:30 a.m. on the southbound 287 ramp to northbound 820.

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(credit: CBSDFW.COM)

The semi veered off the roadway in the bend of a curve, flipping the cab and trailer upside-down, and all spilling lumber and debris all over the road.

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No word yet from police on what led to the crash.

(credit: CBSDFW.COM)

The driver of the big rig suffered minor injuries but us expected to be okay.

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The ramp has been shutdown while crews work to clear the wood from the road and embankment.