A car left Interstate 5 on Saturday afternoon and chose the wrong fork in the road.
The driver, who exited the southbound highway just before 5 p.m., decided South 72nd wasn't right and tried to cut over to the South 74th Street lane instead, said state patrol spokesman Trooper Guy Gill.
The car rolled, injuring the woman in the passenger seat and hitting another car. No one in that car was hurt, Gill said. The woman's injuries aren't life threatening, he said.
Traffic snarled for awhile on the main road, but cleared up relatively quickly. The exit, though, remains closed while troopers investigate.
UPDATE, 9:40 p.m.: The exit opened around 9:30 p.m. Troopers briefly closed all lanes of the southbound interstate earlier in the evening to conduct measurements as part of the investigation.