'Teen Mom 2' Star -- Driving Recklessly Before Fiery Crash ... Cops Say

"Teen Mom 2" star Adam Lind was driving recklessly on a revoked driver's license when he plowed his Corvette into a car driven by an 87-year-old woman ... cops tell TMZ ... but they say drugs and alcohol were NOT a factor.

Witnesses tell us ... Lind was driving VERY fast Friday when he slammed into the elderly woman's car as she was making a left turn. Lind was pulled from the wreckage of his 'Vette moments before it burst into flames.

Cops in Sioux Falls, SD tell us Lind has been charged with a total of five crimes -- in addition to the reckless driving and revoked license charges, he's also been cited for driving with a suspended license, driving an unlicensed vehicle, and not having insurance.

But law enforcement tells us ... there's NO evidence that booze or drugs contributed to the crash.

We're told Lind is still hospitalized with a concussion. The woman and her 94-year-old passenger were treated for broken bones.