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Reach out to your local or state government department of transportation. In the USA, when transportation changes are occurring, some agencies will hold public forums where citizen can voice their concerns and make suggestions. You can always reach out to the organization that oversees transportation planning and funding with your suggestion. Be sure to include reasons why it will be beneficial to mass transportation, operating costs, and the long term return of your suggestion. Best of luck with your concept!
Great advice from Seritta. I'll add that you should consider sharing your idea with as many trusted businesses, government agencies and community members as you can. If your new idea can improve transportation in your local area (and beyond), it will be good to have different trusted perspectives help promote the idea too so it has a chance to be considered by decision makers and be implemented.