“Right move is try both tunnels and flying cars. Otherwise, having 2D streets and 3D buildings means …”

“Reasons I like tunnels: you still travel in 3D fast, but immune to weather, quiet and no risk cars f…”

“Flying car pros: travel in 3D fast. Cons: risk of car falling on head much greater, noisy, grounded …”

“Contrary to press reports, I'm not against flying cars. Just said it was important to consider both …”