Our land division ordinances encourage - but don't require -street and pedestrain linkages between developments. Problem is, there is no set standard and the pol's tend to bow to neighborhood "isolationist pressure" quicker than a skin head at a Pat Buchanan rally (no relation to my Avatar - I promise).
We have countless street stubs that end at plat lines, and when the bordering property developed, they waived the requirement to connect, leaving an embarrassing scar on the landscape.
At the New York APA conference a few years ago I sat through a session (I think from some folks from Oregon) which ranked developments on a point system to determine if they had sufficient connectivity. It was complicated and made me bleed from the eye sockets.
Anyone have a good example of a connectivity requirement or linkage requirement to share?