ok, i had a look at the ingame maps that include lots of inclines, avenues is the best for it...and found it appears to be a completely seperate static object, one that does not appear in the list of usable objects. i can click on it and move it around like a normal piece of road but cannot adjust the hight of the incline.
im very curious as it does appear to be a basic road with a 15-25degree incline on it. still appears as a cube object, unlike the props which actually rotate in freeform. can someone shed abit of light on the matter.