(a) A person propelling a bicycle shall not ride other than upon or astride a permanent and regular seat attached thereto. (b) No bicycle shall be used to carry more persons at one time than the number for which it is designed and equipped, except that an adult rider may carry a child securely attached to his person in a back pack or sling.
625 ILCS 5/11-1503
Riding on bicycles
P.A. 82-132.
Official source: Illinois General Assembly. Reproduced from public-domain Illinois statutes; confirm against the official source for the current text. Not legal advice.