Among the options provided, "amending the driving age" is the public policy issue that could most likely be addressed at the local level. Local governments often have the authority to set certain regulations regarding driving laws, including the age at which individuals may obtain a learner's permit or driver's license.
The other options, such as interstate commerce, vehicle emissions (which can fall under state or federal regulation), and income tax reform, are typically issues managed at the state or federal levels rather than local ones.