According to the Austin Police Department, the driver "drove recklessly to cause a confrontation with other drivers."
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The incident, which occurred on March 23, was captured on video.
The shocking footage shows the driver - who was seen driving a Lexus IS 300 - approaching the entrance ramp and immediately swerving, crossing several lanes and ramming into the woman's pickup truck.
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The video shows the truck nearly flip over the side of the freeway upon impact.
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According to police, the driver placed his hand through his sunroof to "flip off" the woman seconds before hitting her.
A $1,000 reward is being offered for information leading to an arrest.