Creates the Metropolitan Mobility Authority Act, and establishes the Metropolitan Mobility Authority. Provides that the Chicago Transit Authority, the Commuter Rail Division and the Suburban Bus Division of the Regional Transportation Authority, and the Regional Transportation Authority are consolidated into the Metropolitan Mobility Authority and the Service Boards are abolished, instead creating the Suburban Bus Operating Division, Commuter Rail Operating Division, and the Chicago Transit Operating Division. Reinserts, reorganizes, and changes some provisions from the Metropolitan Transit Authority Act and the Regional Transportation Authority Act into the new Act and repeals those Acts. Includes provisions about the operation of the Metropolitan Mobility Authority. Creates the Equitable Transit-Supportive Development Act. Establishes the Office of Transit-Oriented Development. Provides that the Office and the Fund are to aid transit-supportive development near high-quality transit by providing specified funding to municipalities that have adopted the standards in the transit support overlay district for that area or that have adopted zoning and other changes that the Office determines have benefits greater than or equal to such a District, including transit support overlay districts. Includes provisions relating to Office standards, procedures, and reports. Creates the Zero-Emission Vehicle Act. Provides that all on-road vehicles purchased or leased by a governmental unit on or after January 1, 2028 must be a manufactured zero-emission vehicle, repowered zero-emission vehicle, manufactured near zero-emission vehicle, or repowered near zero-emission vehicle. Provides that on and after January 1, 2033, all on-road vehicles purchased or leased by a governmental unit must be a manufactured zero-emission vehicle or repowered zero-emission vehicle. Provides that, by January 1, 2048, all on-road vehicles operated by a governmental unit must be a manufactured or repowered zero-emission vehicle. Sets forth provisions implementing the Act, including requiring the Department of Central Management Services to adopt certain rules. Amends various Acts, Laws, and Codes to make conforming changes for the new Acts and to make other changes. Provides that some provisions are effective immediately.