The state patrol says the squad car was stopped on the left shoulder of the eastbound lanes just east of Austin with its emergency lights flashing.
It was partially in the left lane, but nobody was inside.
Just after eight o'clock, a GMC pickup truck pulling a trailer attempted to pass a Dodge pickup and sideswiped the squad car.
The GMC was pulling a trailer which detached and hit the Dodge truck.
A 73-year-old man in the GMC went to Mayo Health Clinic Austin with non-life threatening injuries.
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