CAJON PASS (CBSLA.com) — A large truck overturned on Interstate 15 in the Cajon Pass on Wednesday evening causing traffic to be backed up in both directions.

The crash happened in the crossover lane of the southbound thoroughfare, where Caltrans had been doing construction.

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At the time of the crash, there was only one lane available to traffic in each direction.

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The accident prompted the closure of the southbound I-15 at Highway 138. Traffic was jammed in both directions.

For an update on traffic conditions, tune-in to KNX 1070 NEWSRADIO and visit cbsla.com/traffic.

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This is a breaking news report. More information will be provided as it becomes available.