If you're heading north out of Kern County, northbound Highway 99 remains shut down Thursday morning after a crash overnight, according to the California Highway Patrol. 

All three lanes of northbound 99 remains shut down just south of Selma following a big rig collision overnight. According to Caltrans, traffic is being detoured at Mountain View Avenue.

Fresno County: Northbound SR-99 remains shut down just south of Selma due to a collision that occurred overnight, resulting in an overturned big rig blocking all three lanes. Traffic is being detoured at Mountain View Ave. There is no ETO at this time #TrafficAlert pic.twitter.com/lkbKbkUAL1

— Caltrans District 6 (@CaltransDist6) May 10, 2018

There is not current estimated time of the lanes reopening.