It happened in the northbound lanes of I-45 near Highway 242.
Houston Transtar Jam Cams showed the traffic at a snarl as crews worked to upright an overturned tractor trailer that struck a car.
The driver's son tells Eyewitness News that his father suffered a crushed leg after he was pinned. He was reportedly taken to a hospital in Conroe, then transferred to Ben Taub General Hospital in unknown condition.
Take ABC13 with you!
Download our free apps for iPhone, iPad and Android devices