How ![alt text][1]How do I tag elevated highways and roads, ie. a road, or roads, that are constructed above a road at ground level and that follow exactly the same path as the ground-level road? I have attached an image taken in Guangzhou, China, where the elevated road shown circles the entire city as the city's inner ring road. Many thanksthanks [1]: /upfiles/elevated-highway-Guangzhou.jpg

How do I tag elevated highways and roads, ie. a road, or roads, that are constructed above a road at ground level and that follow exactly the same path as the ground-level road? I have attached an image taken in Guangzhou, China, where the elevated road shown circles the entire city as the city's inner ring road. Many thanks