A rather vivid dream last night began with a strange man offering a ride to a nearby convention. Traffic was very heavy because the fellow observed that all bridges and roads into San Francisco were closed for repairs, but rather rashly I stepped out of the vehicle en route because I had forgot a soft drink at the starting point, then I couldn't catch up with the car again. I did find that cars were indeed packed into the city very densely, though, as one car was "parked" in such a way that its fender was crushed into another car and I had to climb over them to continue my pursuit. Eventually I found the driver in a completely different vehicle, much smaller with an open front resembling a Ferris wheel car. This vehicle then took flight over a spectacular nighttime city scape, but I often closed my eyes to avoid becoming dizzy while looking down from the vertiginous heights while secured by just a simple safety bar. Another scene then returned to the streets where boxy trucks and cars were having a difficult time in dense traffic with torn-up roads; nonetheless ~ after returning to the ground on a side street ~ I learned that flying cars were only allowed in the city center and not on side streets. I then found myself in a pleasant round room with comfortable seating and two large area maps (neither of which looked much like San Francisco); since one map showed streets and another appeared to show various cities, I asked some young people in the room what those cities were but they said there were no other cities besides "The City" where we were; apparently all communication with anyone outside the city had been cut off long ago after some kind of cosmic event over the North Pole. When I looked at the area map more closely I then found that it was dotted with symbols reminiscent of an old Sim City game.