Abstract: The safety of road transportation can be assured with weather monitoring,forecasting and early warning.This paper largely reviews the development of international research on siting of the Road weather information system(RWIS),road temperature & condition prediction,and impact assessment of transport meteorology.In the meanwhile,the advantage and disadvantage for above-mentioned researches are compared.Then,their future development trends are discussed.Finally,it comes to the conclusion that the abundant data and diverse methods are used on international research for road traffic meteorology.To be specific,the research on RWIS siting develops from the empirical and qualitative approaches to quantitative approaches.The research on road temperature and condition prediction mainly focuses on the improvements of numerical models based on surface radiation balance theory and application of probabilistic forecast.The impact assessment of traffic meteorology tends to develop the risk prediction technique and its application.This paper aims at providing some useful information for the development of technologies for highway traffic meteorology in China.