For at least 100 years, cars have influenced the design and shape of cities. In the next 100 years, cities will influence the design and operation of cars. The city and its qualities must be considered to create a successful mobility-as-a-service (MaaS) business. In turn the requirements of MaaS will influence the design of the smart car. Cities are growing into multi-city mega regions and the percentage of the global population living in these mega regions will be unlike at time in human history. Cars will become part of a complex, integrated multi-modal mobility system. Cars will need to become smart, but in and of itself, will not be enough.