I just want to add in that if we start enabling u-turns en masse all over the map just because you technically "can" turn around safely in like, any driveway, for example, it might also produce the side effect of u-turn rerouting, which, from the advertising features of many other navigation systems, many people hate. This effect happens when you deliberately go a different way than the navigator suggests and then the navigator keeps telling you to make a u-turn to go back to that missed turn for every segment over and over again until you drive far enough for it to consider the next highway (or primary street) is closer than doubling-back. Personally, I can't stand when a navigation program does that.
Wazing the Garden State... one jughandle at a time.
AM: New Jersey, LEVEL 4
AT&T iPhone 5 / iOS 7.0.4 / Waze 126.96.36.199