maybe not for a 30mile commute but i would regularly ride my bmx 6 miles to school hauling ass down the expressway

you go a lot slower, but its a WHOLE lot safer as your on top of the bike instead of in it

bmx bike is a WAYYYYY twitchier and much more responsive ride... also FANTASTIC if your not to keen on following the rules, ie, being able to easily hop between sidewalk and the street, being able to hop medians to get to the other side of the street instead being limited to intersections, being able to stop instantly when your riding the sidewalk facing traffic and approaching a blind driveway.

but yeah... commute on the bmx avg a lil under 20min compared to a lil over 15min on the big bike and a lil under 15min in the car

riding sitting down though..... helll no