By CBS13 Staff

SACRAMENTO COUNTY (CBS13) — All lanes are back open along southbound Highway 99 after a crash clogged traffic Thursday morning.

The crash happened just before 6:30 a.m. near Dillard Road, south of Elk Grove.

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Exactly what led up to the crash is unclear, but a big rig and a sedan appear to have been involved.

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Caltrans said all southbound lanes were blocked just south of Dillard Road. The lanes were cleared by around 7:15 a.m., but traffic remains backed up to Elk Grove.

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Drivers should expect heavy delays through the area for the time being.