[zephjc]

Cars are also super space-wasters. They do nothing but sit for 80-90% of the time (which is one reason why car sharing is making more sense to people). In a lot of cities, especially newer ones built out since WW2, you will find a large percentage of space dedicated to parking lots. Not even necessarily parking structures (which cost a lot more per car) but just free to park flat lots, with nothing going on there.

[windust]

http://cdn.slowrobot.com/524201613515576555.gif :)

[JoshTriplett]

It's a lovely picture, and it makes a great point. If 200 people want to get to the same place, it's far more efficient to pack them into the same vehicle going to that place.

Now what happens when those 177 cars are going to 100 different places?