File talk:Viaduct in Puxi, Shanghai.jpg

In fact it's an urban 6-level stack interchange (Zhang 2008 (talk) 23:31, 18 June 2009 (UTC)), from its top to the ground:
 * 1) the top road (north-south)
 * 2) a |><| ("horizontal")
 * 3) again, a |><| ("vertical")
 * 4) the Western Yan'an Road viaduct (east-west)
 * 5) the red ring (typical for walkers, bikes and motorcycles)
 * 6) the bottom crossroads