This document discusses shared mobility and the barriers, technologies, and policies around it. It notes that shared mobility can help reduce costs compared to private car ownership and help address traffic congestion. However, shared bikes, cars, and future autonomous vehicles face challenges including rebalancing networks, integrating with public transit, insurance issues, and ensuring user convenience and safety. Emerging technologies like IoT, big data, and blockchain could help but also raise privacy and data issues. Policy support is needed to address market failures and help new shared systems, though governments lack perfect information and policies are difficult to transfer. The document advocates for policy innovation, use of social media, and public-private partnerships to realize the benefits of shared mobility.