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In many countries, various in-vehicle Telematics systems are already available, while new systems are being currently designed. This paper introduces a smart roadside server for driver assistance and traffic safety warning. In recent world wide projects, roadside equipment is used for wider applications and becomes a server with more intelligent functions. This paper introduces a concept and framework of smart roadside server in various road systems using Telematics system. We suggest two service and application models in signalized intersection and SMART highway. This system models provide a vehicular safety service to a vehicle terminal of a vehicle located on a road within a service area from a smart roadside server. The smart roadside server is useful for driver assistance and warning by Telematics devices.