A woman riding in a Chevy Impala in south Sacramento was impaled by a long metal tool that fell off the truck in front of her.

The incident occurred shortly after 10 a.m. Saturday on State Route 99 south of Fruitridge Road when a 4-foot-long tamper-head digging bar tumbled off a big rig on State Route 99, the California Highway Patrol said.

The bar bounced off the roadway, shot through the engine compartment of an Impala traveling behind the semi and speared the right leg of the car's passenger. The driver took the next exit and called 911.

Police and firefighters from Sacramento responded and administered aid before the victim was taken to a nearby hospital. She was reported in stable condition.

Neither the victim nor the driver were identified by police.

The driver of the big rig did not stop, according to CHP. Some commenters on the CHP South Sacramento Facebook page suggested that it was more likely that the bar fell of a landscaping truck than a big rig and speculated that the semi kicked it up while driving over it.

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Troopers ask that anyone who witnessed the incident or has information about the truck contact Officer Jim Young at [email protected]

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Mike Moffitt is an SFGATE Digital Reporter. Email: [email protected] Twitter: @Mike_at_SFGate