Local Govt Transportation System Financing.

SB 584 authorizes counties to use specific sales tax revenue to fund local public transportation systems - including buses, light rail, bike lanes, and transit facilities - while requiring these funds to supplement (not replace) existing transportation budgets. It defines "public transportation system" broadly to include infrastructure like bus lanes, shared-ride services, and integrated fare systems. The bill also creates a new metropolitan public transportation authority for counties with over 1 million residents that border another state and operate light rail systems, giving them regional planning powers under specific rules. This authority would manage funding and coordination for transportation projects within its jurisdiction.