Here is a link to a video that implies that those bumps have a function :
Skip to 10:39 where the guy talks about the aerodynamics of the car.
Point twenty nine Cd
??? And that is with a full smooth belly-pan.
Sad . Just sad.
I still don't buy that bit about the frog eye headlights being needed for wind noise.
Not only did the EV-1 not have them, but the Volt doesn't either...or the Tesla ... or the Fisker Karma.