A crash closed a portion of southbound Interstate 17 ahead of the Friday morning commute.
According to the Arizona Department of Public Safety, a pickup truck sideswiped another vehicle, lost control and rolled near Northern Avenue.
The driver was reportedly ejected, causing life-threatening injuries. The driver of the other vehicle was treated at the scene.
Officials say the crash caused some damage to the roadway and the Arizona Department of Transportation is assessing the road for safety.
DPS says impairment has not been ruled out as a factor in the crash.
According to the Arizona Department of Transportation, southbound lanes of the I-17 were shut down from Dunlap to Northern avenues for several hours.