street union

hi all

I'm having troubledeleting the curves I don't need.

I tried with surfaces and mesh shadow but had no consistent luck...

I'm drawing streets...

I want to limit my results to my enclosing outer limit (delete the little pieces that stuck out) and make the inside part all a single surface...

had no luck yet... 

I need also them to be a single surface to be able to eliminate certain points from inside the streets afterwards too...

ideas?