He doesn't. But if we assume it's like mario Kart and so racing cups every racing cup in the world has rules. We can assume one of them = Must drive vehicle at all times. So while he does not need one he does in order to not get disqualified.
"Sonic & SEGA All-Stars Racing is no ordinary racing game. Its huge variety of characters and vehicles, plus the ability to play both online and off set it apart from other games of this type" said Gary Knight of SEGA Europe Ltd in a press release. "The team have pushed the boundaries on what you would normally expect and created a different and unique party racing title whereby you really can't take anything for granted!"
E3 2009: Sonic & SEGA All-Stars Racing Hands-on
It's like Mario Kart with SEGA characters.
I know what you've been thinking. I'm tired of Mario Kart, Nascar Kart Racing, Crash Nitro Kart, and I don't want to play the upcoming MySims Racing. Aren't there any other kart racing game options available to me? There, there. There, there. Dry those crying eyes because a new contender in the kart racing genre might have just what you're looking for. Sonic & SEGA All-Stars Racing, set to hit PlayStation 3, Xbox 360 and Wii in early 2010, is a kart racer like all those other ones, but get this: you can play as SEGA and Sonic characters. Right? I thought so.