Focusing on “mobility” as a pivotal theme in urban living environment development, this section comprehensively examines the relationship between urban transport systems and residents' daily travel behaviour. Content encompasses diverse datasets including transport network layout, road infrastructure, public transport systems, and the interplay between urban development and mobility. Integrated with environmental, economic, and social sustainability indicators, it facilitates assessments of urban transport accessibility and service functionality. By analysing key indicators such as roadside greening and travel convenience, it supports cities' transition towards low-carbon, green, and sustainable transport models. Furthermore, this section integrates with other urban living environment themes (such as housing, comfort, and safety), consolidating multi-domain, multi-dimensional data resources. It provides scientific evidence and decision support for urban planners, policymakers, and residents, driving the creation of more liveable, efficient, and secure travel environments.