Replying to The small gap where rails are put together.

I'm in college now in a city and so far i've been walking around campus scoping out some cool rails i'd like to do an urban session on. But some of the rails have these fucked up little gaps like where the pieces were put together. Like were only talking like 1/8 inch gaps, but i'm just thinking what that would be like sliding. If you hit that i'd think you take a mad face plant forward. Also some of them have rust spots on them too. i'm just wanding what you urban vets do to bypass this. Or would you not attempt these at all?