Why would anyone realistically -- i.e., outside the realm of pure fantasy -- want a flying car? People can barely handle one-and-a-bit dimensions at 70mph (i.e., a road with discrete lanes), how well do you think the general population would cope with this? Maybe autonomous flying vehicles would be more practical, but that still leaves the other two main problems wide open:<p>1. The energy required to keep the vehicle in the air.<p>2. The boarding-and-alighting (i.e., landing) bottleneck.