It is my pleasure being the Editor-in-Chief of the Journal of Smart Cities (JSC) established in 2015. In the past three years, the founding editor prof. Andreas J. Kappos has made great effort to this journal to promote research for the improvement of all sub-systems of cities, including urban infrastructure, construction, mobility, energy saving and renewable energy, health and social care, safety in the public space, work and innovation, and make the city easily accessible, effective, efficient, and an attractive place to live. Now, smart city has already been developed into a new concept to support the urban development in the world. The application and innovation of smart cities can effectively improve the efficiency of urban management and the quality of life in cities. I would like to do my best to keep a good heart of JSC to bring an international readership from many disciplines of researchers, developers, users, and decision makers to share and advance knowledge on smart cities.

Taxi mobility has long been a heated research topic in the fields of geography, physics, complex network science, and computer science. Existing studies focus on the spatio-temporal variation of taxi mobility and taxi operation strategy. However, with the advent of e-hailing taxi services, more and more scholars turn to uncover the impacts of the emerging travel mode on human mobility and urban dynamics. For example, some researchers studied the taxi market equilibrium after the emergence of e-hailing services. And others focus on comparing the difference in taxi pricing strategies and policies between traditional taxi market and e-hailing services. In this article, we systematically reviewed existing research on taxi mobility and impacts of e-hailing services on traditional taxi market. Further research is needed so that could help build up a better understanding of taxi mobility and e-hailing services.