The wreck in the westbound lanes of I-10 at Thompson was reported on Houston Transtar's incident page at about 4:30 a.m. and had cleared about two hours later.
The driver from Florida was stopped in one of the lanes and had no lights on when his vehicle was hit, authorities said.
Baytown detectives and the Harris County medical examiner responded to the scene
The man's exact cause of death is under investigation.
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