70 ILCS 1505/7.02
The commissioners of the Chicago Park District, except as otherwise herein provided, may from time to time establish by ordinance all needful rules and regulations for the government and protection of parks, boulevards and driveways and other property under its jurisdiction and provide penalties not exceeding $500 for any one offense for violation of such rules and regulations. The city may exclude all objectionable travel and traffic and may make and enforce reasonable traffic and other regulations and provide penalties not exceeding $500 for any one offense for the violation of such rules and regulations. However, the Chicago Transit Authority, without permission of the city to which the boulevards and driveways have been transferred, may operate any standard type motor buses in and upon the boulevards and driveways under the jurisdiction of said city.
70 ILCS 1505/7.02