The layout and application of a meteorological experts system designed for road meteorological service is introduced. The layout frame of the meteorological experts system, the technical procedures, and products related to road weather conditions, such as the puddle index and slipperiness index of the road surface, visibility index, high temperature tyre breaking index, and heavy wind index, are discussed. The application tests are conducted on the system during high risk weather processes, and the results indicate that the meteorological expert system performed satisfactorily in road weather service.