The transition toward sustainable urban mobility is not merely a technical challenge but a fundamental reimagining of public space. This briefing synthesizes insights from a 2,000-kilometer investigation across five European countries, analyzing cities that have successfully reduced car dependency in favor of livable, human-centric environments. The primary findings indicate that the "transport transition" (Verkehrswende) succeeds through a combination of clear political mandates, the redistribution of physical space, and the courage of leadership to prioritize long-term social health over short-term political convenience.