Found the Detour Decision Point! Narrowing it down to Margham helped a lot!
When Kurt/Brodie are leaving you can see two distinct roads, running almost parallel. This narrows it down along the entirety of the Margham road to one particular intersection, where you can find the building against which the teams parked!
This would explain the footage of al-Awir Roundabout; teams left the airport, took the I-66, but then changed to the E-44 (passing al-Awir), entering the Margham road from the northeast, then exiting from the southwest back onto the I-66. Left turn for the "oasis", right turn for the camel racetrack (making a U-turn at Ud al-Bayda to enter the racetrack from the north).