don't ride your bike on the sidewalk

Urbana police are -- rightly! -- enforcing a prohibition against riding your bike on sidewalks.  You shouldn't be riding on the sidewalk in the first place, but the $100 fine for a citation might be more persuasive than our moralizing.  Here's a blog post from the City of Urbana:

please note that riding bikes on downtown sidewalk is prohibited. Due to the large number of pedestrians walking, diners eating outdoors, and shoppers stepping out of shops, the sidewalk is not a safe place to ride a bicycle. For everyone's safety, the City asks you to dismount and walk your bicycle on downtown sidewalks. Thank you for your cooperation.

Riding a bicycle on downtown sidewalks is punishable by a $100 fine.