Addressing our pressing challenges related to the increasing demand for mobility, we must make fundamental transformations in how communities use and access transportation. A mobility system encompasses the interactions of three heterogeneous dimensions: (1) technological developments on transportation systems and modes that lead to emerging mobility systems, e.g., autonomous vehicles, shared mobility; (2) social behavior of drivers and travelers interacting with these systems; and (3) institutional behavior of organized units such as administrators that govern the transportation systems through policies. The constellation of these dimensions constitutes a sociotechnical system that should be analyzed holistically. Yet current methods analyze, design, and optimize a mobility system without considering the social and institutional dimensions, resulting in mobility systems that might not be acceptable to travelers or might impose inequities.