Well, there is a clear delineation of potential property damages that might occur from two completely different, yet similar, actions. One being the potential risks of drunken cycling. Two being the potential damage of drunken driving.

Look at it this way, we have felonies and misdemeanors for different crimes.

Granted, when the penalties for DUI meet a certain criteria---thanks to organizations such as MADD---the penalties are cut and dry. The OP, casually cycling down his neighborhood gets the same penalty as the drunken bar hopper going 98 mph in his BMW. Well, the guy in the BMW also gets a speeding citation.