Dunno about the Columbus, Ohio, version of the Doo Dah Parade, but the original Pasadena, CA, Doo Dah Parade isi known for its farcical attitude. Someone would need to ask the owner/driver of the Columbus vehicle displaying the sign and crashed bicycle for his intent. It may have been intended as an ironic jab at thoughtless drivers. Who knows. That sort of humor tends to misfire in the court of public opinion.