In addition, according to the 2017 global mobility report,10 mobility should be equitable in access, efficient, safe, and climate responsive. Issues of public-transit-related crimes are identified as key focus areas under this element, which particularly constrain women's mobility and which, in turn, should be tackled. Transport efficiency applied in a macroeconomic perspective implies the optimization of resources—energy, technology, space, institutions and regulations—to generate an efficient transport system or network. For example, it is projected that by 2030, annual global passenger traffic for all modes will exceed 80 trillion passenger-kilometres—a 50 per cent increase compared with 2015 estimates, while an additional 1.2 billion cars will be on the roads by 2030—double the total in 2017.*" Indeed, such exponential growth of transport will have significant socioeconomic impacts on the livelihoods for billions of urban dwellers, and significantly affect the urban environment.