This book constitutes the joint refereed proceedings of the 4th International Workshop on Communication Technologies for Vehicles/Trains, Nets4Cars 2012 and Nets4Trains 2012, held in Vilnius, Lithuania, in April 2012. The 4 full papers of the rail track and 11 full papers of the road track presented were carefully reviewed and selected from numerous submissions. They provide an overview over latest technologies and research in the field of intra- and inter-vehicle communications (protocols and standards), mobility and traffic models (models, methodologies, and techniques), testing, and applications.

This book constitutes the joint refereed proceedings of the Third International Workshop on Communication Technologies for Vehicles, Nets4Cars 2011and the First International Workshop on Communication Technologies for Vehicles in the Railway Transportation, Nets4Trains 2011, held in Oberpfaffenhofen, Germany, in March 2011. The 7 full papers of the rail track and 12 full papers of the road track presented together with a keynote were carefully reviewed and selected from 13 and 21 submissions respectively. They provide an overview over the latest technologies and research in the field of intra- and inter-vehicle communication and present original research results in areas relating to communication protocols and standards, mobility and traffic models, experimental and field operational testing, and performance analysis.

This book constitutes the joint refereed proceedings of the 5th International Workshop on Communication Technologies for Vehicles/Trains, Nets4Cars 2013 and Nets4Trains 2013, held in Vilnius, Lithuania, in May 2013. The 12 full papers of the road track and 5 full papers of the rail track presented together with 3 invited talks were carefully reviewed and selected from 24 submissions. They address topics such as intra-vehicle, inter-vehicle and vehicle to infrastructure communications (protocols and standards), mobility and traffic models (models, methodologies, and techniques), testing, and applications.