Is now a good time to bring up my mass produced 900 kg all-aluminum car, with its 3.2 l/100 km demonstrated real-world fuel economy? Or the idea of short range battery-electric cars with traction power (like trolley buses) once you're out of your neighborhood? Or, bicycle paths in tunnels so they're not so miserable in the rain and snow?

There are lots of ways to skin the transportation cat.