A proposed law that would legalize lane splitting and enact a helmet law in Illinois, State Bill 2439, has been postponed three times this month by the Illinois Senate Transportation Committee, most recently on February 14. The official synopsis:
Amends the Illinois Vehicle Code. Provides that, during periods of traffic congestion, a person may, in a safe and prudent manner, operate a motorcycle between lanes of traffic or between adjacent lines or rows of vehicles. Requires every operator and passenger on a motorcycle, motor driven vehicle, or motorized pedalcycle to wear a helmet.
As you might have guessed, 2sb’s official position, regardless of the law, is that you should wear a helmet and not split lanes.