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Riding Two Abreast

Bicycles are subject to the laws of the jurisdiction in which they are ridden. If there is no local statute to the contrary, Illinois law applies. Illinois state law allows bicyclists to ride two abreast.

See the relevant Illinois Compiled Statutes:

(625 ILCS 5/11‑1505.1) (from Ch. 95 1/2, par. 11‑1505.1)
Sec. 11‑1505.1. Persons riding bicycles or motorized pedal cycles upon a roadway shall not ride more than 2 abreast, except on paths or parts of roadways set aside for their exclusive use. Persons riding 2 abreast shall not impede the normal and reasonable movement of traffic and, on a laned roadway, shall ride within a single lane subject to the provisions of Section 11‑1505.
(Source: P.A. 83‑549.)

In Chicago, this is not the case. Riders can only ride single file. See Chicago Muni Code:

9-52-050 Riding in single file required--Exceptions.
Persons riding bicycles upon a roadway shall not ride other than single file except on paths or parts of roadways set aside for the exclusive use of bicycles.

(Added Coun. J. h="7" 7-12-90, p. 18634)