Houston TranStar reported the incident at about 6:36 a.m., which completely closed the roadway on SH-99 Lanier/Grand Parkway North westbound after Cypress Rosehill Road.
SkyEye13 flew over emergency crews responding to the scene, where a concrete mixer from RS Concrete rolled over a ditch, trapping its driver, according to the Harris County Sheriff's Office.
RS Concrete officials confirmed the accident involves their truck and employee. They said their employee was taken to a hospital, and is expected to be OK.
Authorities have not said what led to the incident.
The roadway remains closed off as law enforcement investigates.
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