Police say a woman was driving fast on the access road of Loop 1604 when she lost control, skidded, then fell 20 feet onto the highway below.
That crash happened around 11:30 Saturday night near the NW Military intersection.
Investigators say the woman in her 20's skidded an estimated one thousand feet on the median between the access road and the highway.
They say her car then plunged off a ledge and landed on the main lanes of 1604 about 20 feet below.
The driver was complaining of shoulder and back pain and was taken to the hospital.
Police say alcohol might have been a factor.