If you insist, you can forgo the button and put a foot down to steady yourself at stops, just as on a regular two-wheeler. And, in fact, in all other situations, the MP3 feels utterly conventional. If you were magically plopped into saddle at speed, you wouldn't know there was an extra wheel up front. In turns, the bike countersteers and leans just like a single-track vehicle. In enlightened states like California where lane-spitting is legal, it even threads through traffic jams with no undue drama.