ALABAMA STATE LAW:
Section 32-5A-284 Duties of person regularly engaged in business of renting bicycles. (a) A person regularly engaged in the business of renting bicycles shall require each person seeking to rent a bicycle to provide his or her signature either on the rental form or on a separate form indicating both of the following: (1) Receipt of a written explanation of the provisions of this article and the penalties for violations. (2) A statement concerning whether a person under the age of 16 years will operate the bicycle in an area where the use of a helmet is required. (b) A person regularly engaged in the business of renting bicycles shall provide a helmet to any person who will operate the bicycle in an area requiring a helmet, if the person does not already have a helmet in his or her possession. A reasonable fee may be charged for the helmet rental. (c) A person regularly engaged in the business of selling or renting bicycles who complies with this article shall not be liable in a civil action for damages for any physical injuries sustained by a bicycle operator or passenger as a result of the operator's or passenger's failure to wear a helmet or to wear a properly fitted or fastened helmet in violation of this article.