I have always been amazed by the way urban planners try to re-model the city so that skateboarders cannot carry out their activities. I have to take picture of this urban struggle. A common way is that they place "metal discs in the joins of these makeshift skate ramps. These discs prevent a skateboarder from getting any speed or distance on these runs. The same concept can be applied to hand rails to prevent dangerous riding stunts on hand rails." (via). Urban Structure addresses those issues. Like him, I think skaters are always creative and can find ways to by pass this. For instance, a picture taken from daily lobo: