Thanks so much for this @Roule_Thoune!. It works!!!.
Followed your steps and I was able to climb the AdZ and do many U-Turns!.
As you suggested, I selected the “Jungle Circuit” route and manually navigated to the AdZ. Climbed it and did several U-Turns after the top banner. It works perfect!. 
The trick is NOT to select “Road to Sky” route as you would be completing the route at the top banner, and would hit the U-Turn bug. When selecting “Jungle Circuit” and manually navigating to the AdZ you don’t complete routes. This way you avoid the U-Turn bug at the AdZ!!!.
Thanks SO MUCH!.