Abstract: Transport information is the basis for transportation development.Meanwhile,transport at..on safety is one of the important purposes for transportation studies.It has attracted attention from academia within the intelligent and connected transportation environment.The 4th International Conference on Transportation Information and Safety (ICTIS 2017) is committed to promoting the developments of transport information and safety.Hot issues on the core contents are discussed,including diversified application of maritime information,maritime accident analysis and ship collision avoidance,information interaction between road and infrastructure,and optimization of public transportation.The latest research results are elaborated as well.Issues discussed at the conference are summarized;the trends and existing problems of traffic safety are discussed.Further research directions of transport at:on information and safety are also mentioned during the conference,and the direction includes safety risk and prevention of new energy ship,dynamic forecasting of multi-class and multi-mode of traffic flows,developments and applications of Unmanned Surface Vessel,road and traffic safety information modeling.