your totally right, i used to plan out sytems and they always get grid locked eventually lol......personally i love going through and taking out the old and maticulously reworking the new lol......
although I hate terring down skyscrapers though especially when poor people move in lol......
I have this one area in my city, which is mostly streets with a side road that runs along the medium air port. Of course I didn't relize that every single street apparenlt empties inti this road lol, and I refuse to put in an avene lol so much or that side of the city would be destoryed lol. what i think i'll do is tear out the air port and move it over a row or two.....
then the only problem will be getting rid of the landfills!! no matter what i do they wont go away!