Illinois has no helmet law

Illinois's current motorcycle laws:

(625 ILCS 35/) Cycle Rider Safety Training Act.

(625 ILCS 35/1) (from Ch. 95 1/2, par. 801)
Sec. 1. This Act shall be known and may be cited as the "Cycle Rider Safety Training Act". It is the policy of this State to promote safety for persons and property connected with the use and operation of motorcycles, motor driven cycles and motorized pedalcycles.
(Source: P.A. 86-1005.)

(625 ILCS 35/2) (from Ch. 95 1/2, par. 802)
Sec. 2. As used in this Act, the terms specified in Sections 2.01 through 2.06 have the meanings ascribed to them in those Sections unless the context clearly requires a different meaning.
(Source: P.A. 82-649.)

(625 ILCS 35/2.01) (from Ch. 95 1/2, par. 802.01)
Sec. 2.01. "Cycle" means a motorcycle, motor driven cycle or motorized pedalcycle, as defined in The Illinois Vehicle Code.
(Source: P.A. 86-1005.)

(625 ILCS 35/2.02) (from Ch. 95 1/2, par. 802.02)
Sec. 2.02. "Cycle Rider" means every person who rides and is in actual physical control of a cycle.
(Source: P.A. 82-649.)

(625 ILCS 35/2.03) (from Ch. 95 1/2, par. 802.03)
Sec. 2.03. "Cycle Rider Safety Training Courses" and "Courses" mean courses of instruction in the use and operation of cycles, including instruction in the safe on-road operation of cycles, the rules of the road and the laws of this State relating to motor vehicles, which courses meet the minimum requirements of this Act and the rules and regulations issued hereunder by the Department and which have been approved by the Department as meeting such requirements.
(Source: P.A. 82-649.)

(625 ILCS 35/2.04) (from Ch. 95 1/2, par. 802.04)
Sec. 2.04. "Department" means the Illinois Department of Transportation.
(Source: P.A. 82-649.)

(625 ILCS 35/2.05) (from Ch. 95 1/2, par. 802.05)
Sec. 2.05. "Driver's License" means any license or permit to operate a motor vehicle under the laws of this State.
(Source: P.A. 82-649.)

(625 ILCS 35/2.06) (from Ch. 95 1/2, par. 802.06)
Sec. 2.06. "Person" means every person, firm, partnership or corporation.
(Source: P.A. 82-649.)

(625 ILCS 35/3) (from Ch. 95 1/2, par. 803)
Sec. 3. The Department shall have the power, duty and authority to administer this Act.
(Source: P.A. 82-649.)

(625 ILCS 35/4) (from Ch. 95 1/2, par. 804)
Sec. 4. Any State or community college, State university or community agency designated by the Department may organize a Regional Cycle Rider Safety Training Center and may offer cycle rider safety training courses through such Training Centers which it operates. The curriculum and accreditation for the courses, and the geographic areas in which each Training Center may offer the courses, shall be provided for by rules and regulations of the Department. Instructors of such courses shall meet the qualification and certification requirements of the regulations of the Department and the college, university or community agency offering the program and may be employed on a calendar year rather than a school year basis. Such courses shall be open to all residents of the State who hold a currently valid driver's license and who have reached their 16th birthday without regard to whether such person is enrolled in any other course offered by said State or community college, State university or community agency. Such courses may be offered throughout the calendar year. The courses may be offered as credit or noncredit courses, but no fee shall be charged except for a nominal registration fee which shall be refunded upon completion of the course.
(Source: P.A. 86-1005.)

(625 ILCS 35/5) (from Ch. 95 1/2, par. 805)
Sec. 5. The Department may promulgate rules and regulations not inconsistent with the provisions of the Cycle Rider Safety Training Act for the administration of the Cycle Rider Safety Training Act.
(Source: P.A. 82-649.)

(625 ILCS 35/6) (from Ch. 95 1/2, par. 806)
Sec. 6. To finance the Cycle Rider Safety Training program and to pay the costs thereof, the Secretary of State will hereafter deposit with the State Treasurer an amount equal to each annual fee and each reduced fee, for the registration of each motorcycle, motor driven cycle and motorized pedalcycle processed by the Office of the Secretary of State during the preceding quarter as required in subsection (d) of Section 2-119 of the Illinois Vehicle Code, which amount the State Comptroller shall transfer quarterly to a trust fund outside of the State treasury to be known as the Cycle Rider Safety Training Fund, which is hereby created. In addition, the Department may accept any federal, State, or private moneys for deposit into the Fund and shall be used by the Department only for the expenses of the Department in administering the provisions of this Act, for funding of contracts with approved Regional Cycle Rider Safety Training Centers for the conduct of courses, or for any purpose related or incident thereto and connected therewith.
(Source: P.A. 86-1005; 87-838; 87-1217.)

(625 ILCS 35/7) (from Ch. 95 1/2, par. 807)
Sec. 7. The Department is authorized to and shall award contracts out of appropriations to the Department from "The Cycle Rider Safety Training Fund" to qualifying Regional Cycle Rider Safety Training Centers for the conduct of approved Cycle Rider Safety Training courses.
(Source: P.A. 82-649.)