What would be the most effective way to initiate a grassroots movement for better cycling infrastructure in a community with a strong car-centric culture and little to no existing bike lanes, considering the need to balance the interests of various stakeholders such as local businesses, residents, and motorists, and how can cyclists and advocates build a convincing argument for the economic and environmental benefits of investing in cycling infrastructure, given that many decision-makers may be skeptical of the value of such investments.