I agree with Asim that it takes too long to restart, but honestly so fun! My current highscore is 6922 :)
A bug? The passengers didn't recognize that I was in the circle all the time, some times I would run out of time before they came and rewound the taxi, and that enabled me to play again. I don't know if that's what you had in mind, but to me is seems kind of strange.
Great game thought! Love it!
-Revaliz