State has a Far Right as Practicable Requirement

A bicyclist traveling slower than normal traffic must ride as close as practicable and safe to the right-hand curb or edge of the roadway. Exceptions include passing, preparing for a left turn, avoiding hazards, riding in a substandard-width lane, and approaching a right-turn area.

Allows Two Abreast Riding

Illinois expressly permits bicyclists to ride two abreast, provided they do not unreasonably impede traffic. Riding more than two abreast is prohibited except on facilities set aside exclusively for bicycles.

Single File is Required

Illinois allows bicyclists to ride two abreast. Riding more than two abreast is prohibited except on facilities set aside exclusively for bicycles, and riders two abreast may not impede the normal movement of traffic.

Has a Safe Passing Law

Illinois requires motorists to leave at least three feet of clearance when passing a bicyclist, and to change lanes first if another lane is available and safe to use. Reckless close passing that injures a bicyclist can be prosecuted as a misdemeanor or felony.

Helmets are required on the road

Illinois has no statewide bicycle helmet requirement for traditional bicycles or standard e-bike riders. Some local jurisdictions may impose their own helmet ordinances.

If Bike Lanes are present, they are required ( except when unsafe )

Illinois does not require a bicyclist to use a bicycle lane simply because one exists. Cyclists may lawfully use a regular travel lane while complying with the general right-hand positioning rule.

Riders may use the sidewalks

Sidewalk riding is generally allowed statewide, subject to conditions: the rider must yield to pedestrians and give an audible signal before passing, and local traffic-control devices may prohibit it in specific locations.

Does the Impeding Statute Apply to Bikes

Illinois generally requires a slower bicyclist to ride near the right edge of the roadway, but riders may take more of the lane to avoid hazards or where the lane is too narrow to share safely. Riders two abreast may not impede the normal movement of traffic.

Whether cyclists may treat stop signs as yield signs (the "Idaho stop").

Illinois has not adopted a stop-as-yield ("Idaho Stop") law. Because bicyclists carry the same duties as vehicle drivers, they must obey stop signs and traffic signals the same way motorists do.

Restrictions exist on e-bikes and usage

Illinois uses a three-class e-bike system based on motor wattage (under 750 watts) and top assisted speed. E-bikes generally follow the same rules as bicycles, may not be ridden on sidewalks, and Class 3 e-bikes require the operator to be at least 16 years old. Local governments may restrict e-bike use on specific bicycle paths.

Allows the concept of Contributory Negligence that allows any contributory fault resuls in 'no fault'

Illinois does not follow contributory negligence. Illinois uses a modified comparative negligence system: a bicyclist may recover damages if they are not more than 50% at fault, with damages reduced according to their percentage of fault.