a nice interview with the taxidriver (actually only in german):
http://www.sueddeutsche.de/leben/artikel/500/148150/
fast translation of the most important part:
Reporter:
Isn't it illegal to drive without licence?
Taxi-Driver:
Well, i don't say anything about it now... but in this moment I couldn't care less: Being a passanger of Michael Schumacher, you couldn't miss that chance, could you? His drivingstyle is indescribable, you have to experience it! Just how he takes the corners... you don't feel anything! And how he overtook, just like butter [dunno if it's common in english but in german it means "very soft"]! The changing of the gears! And all that in a Opel Vivaro!
Reporter:
So you put the metal to the pedal?
Taxi-Driver:
He drove the route in 30 minutes where i need 40. But thats all i gonna tell you.