STOCKTON (CBS13) – Officers say a big rig's trailer apparently just collapsed in on itself while driving through San Joaquin County.

The incident happened Monday evening.

According to California Highway Patrol's Stockton division, a tractor-trailer was heading southbound on Jack Tone Road when – without warning – the trailer just collapsed.

Luckily, officers say, no one was hurt.

However, it did take a few hours to clean up the mess left by the collapse.

It's unclear what caused the trailer to fail.