i too also live in elgin,il and i havnt challenged the law on this yet cause my bike isn't done.but i am looking forward to it.ive lost my driving privileges in illinois and that is my cause for doing this build.ive delt with the legal system a long time here and i know its really bad. but i would fight it in court by bringing in 3 pictures ,one of a real moped, one of a bicycle and one of a bicycle with a 50 cc engine on it and ask the judge,what is this,this is nothing more than a bicycle,it is what it is.just cause i modified it with an engine doesn't turn it into a moped! its still a bicycle and as far as the law is wrote here,no one needs a drivers license to use a bicycle. i wouldn't really be pressing the issue of trying to register a motorized bicycle in this state either,cause thats what illinois wants,more control over its residents. just call it what it is ,a 'bicycle' and dont try to get it registered.