Part of the promise of new technological opportunities within transportation is the opportunity to use space more efficiently. Connected and autonomous vehicles can travel closer together, ride-sharing can fill a portion of the staggering amount of empty vehicle seats on our streets and thus reduce some vehicles, and ride-hailing transportation may make it possible to reduce overall car ownership and the need for so much parking, freeing up space on streets and in our communities. Yet, one of the most efficient inventions humanity has ever created also happens to be a space-saving form of mobility – the bicycle. Cities of all shapes and sizes all over the world are “re-discovering” how space, efficiency, distance, economy, health, and sustainability can be addressed through investing in bicycle transportation. Along those lines, London just announced a massive investment in bicycle transportation, seeking to make it a rational option for both short and commute-distance trips. Our challenge now, is figuring out how to right-size each form of transportation, from walking to biking to carsharing to transit to AVs, throughout our cities and communities to maximize not only our ability to reach our desired destinations quickly, but also to maximize the efficient use of limited space, as well as addressing issues of equity, health, and the environment.