The weather hazard warning in simTD: A design for road weather related warnings in a large scale Car-to-X field operational test

Inter-vehicle communication and communication between vehicles and infrastructure (C2X) is a promising technology towards enhancement to active road safety and traffic efficiency. Thereby, vehicles create an ad-hoc network with adjacent vehicles and roadside stations in order to exchange foresighted traffic information. These messages may contain warnings of hazardous situations or information for traffic efficiency enhancements. One of various possible use cases for C2X is the Weather Hazard Warning. Within this use case, information and warnings about local weather events are delivered to drivers on the road. Therefore, weather relevant data obtained from the existing infrastructure of weather measurement stations are combined with data gathered by vehicles driving along roads. In this work, we describe an architecture which may enable such a Weather Hazard Warning in lard scale C2X communication field operational tests. The architecture is developed in context of and will be embedded in to the German research project Safe and Intelligent Mobility - Test Field Germany. However, it may serve as a reference implementation for a potential rollout of C2X communication.