Durango was T-boned on driver's side. Durango was turning left into a parking lot from a county road. Tahoe was going 50-55+mph in the same lane and direction as Durango. Durango put on left turn signal, slowed down to ~10mph, and turned left towards parking lot. At the same time, Tahoe sped up behind Durango, Tahoe tried to pass Durango on the left. Tahoe collided with left side of Durango, pushing it 30+ feet into the ditch. Tahoe drivers airbag deployed. No airbags deployed in the Durango. The Driver of the Durango smashed head/face into door column, causing concussion, whiplash, contusion to forehead/eyebrow requiring 8 stitches.