Crews are on the scene of a three-vehicle accident, involving a jackknifed big rig, that has closed all southbound lanes of Highway 99 near Eschinger Road south of Elk Grove.

The Cosumnes Fire Department reported the accident via Twitter at 4:11 p.m.

Caltrans reported collision on southbound Highway 99 in Elk Grove just north of Dillard Roard, with a detour at Grantline Rd.

“Avoid SAC SB 99 if possible. Multiple crashes have traffic backed up for several miles,” the state Department of Transportation reported on Twitter.

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Google traffic shows traffic at a standstill from north of Elk Grove Boulevard to south of Twin Cities Road.

“The accident has resulted in a traffic back up on 99 to Elk Grove Blvd, and it is continuing to grow. Use alternate routes,” the Cosumnes Fire Department said on Twitter.

This is a story in progress. Check back soon at sacbee.com for more information.