Forsyth County authorities said one man was critically injured following a single vehicle wreck during rush hour Tuesday afternoon on Ga. 400.

Division Chief Jason Shivers, spokesman for the Forsyth County Fire Department, said the wreck occurred in the wooded area of the entry ramp, just north of Ga. 400 exit 15.

Shivers said the driver, an adult male, was briefly entrapped in the vehicle with severe, traumatic injuries, but was extricated and taken by ground to North Fulton Regional Hospital.

According to Cpl. Doug Rainwater, spokesman for the Forsyth County Sheriff’s Office, 911 began receiving numerous calls about an allegedly erratic driver weaving in and out of traffic at a high rate of speed on Ga. 400 near exit 13, late Tuesday afternoon.

“In minutes we began receiving calls that a vehicle had wrecked at [Ga. 400] exit 15,” Rainwater said.

He said witnesses reported the vehicle lost control, ran off the road and struck a tree in the wooded area of the entry ramp.

Rainwater said the “wrecked, mangled car” that was found at Ga. 400 exit 15, a maroon sedan, matched descriptions of the vehicle that was witnessed allegedly driving erratically near exit 13.

Shivers said emergency services had planned to transport the driver from the scene via helicopter, but the helicopter experienced mechanical troubles and, “had to set down in a field north of the wreck site.”

Rainwater said the highway was briefly closed in preparation for the helicopter landing, but was quickly reopened when the helicopter was diverted and the driver was taken away by ambulance.

He said the incident is currently under investigation by the Forsyth County Sheriff’s Office Traffic Unit.