That has to be the most clever use of Sonic I've ever seen in an animation. I wouldn't have thought of him mimicing a police car with a siren on his hat, chasing a speeder down a highway.
Aside from that, the animation was great. It reminds me of those choppy cartoons from the 70's, where mouth movement for talking consists of only a few frames.
I hope you'll make more animations about obscure yet frequently used things like something as significant as E-Z Pass.