This book constitutes the proceedings of the 6th International Workshop on Communication Technologies for Vehicles, Nets4Cars/Nets4Trains/Nets4Aircraft 2014, held in Offenburg, Germany in May 2014. The contributions are organized in topical sections named: automotive issues, car-to-car, aviation issues, in-car, and infrastructures.

Automotive Issues: Evaluation of WiFi for Kart Racing Monitoring.- Automated RF Emulator for a Highly Scalable IEEE802.11p Communication and Localization Subsystem.- IEEE 802.15.4 Based Wireless Sensor Network for Automotive Test and Measurement Applications with Predictable Frequency Agility.- Car-to-Car: Context-Aware Retransmission Scheme for Increased Reliability in Platooning Applications.- An Improved Relevance Estimation Function for Cooperative Awareness Messages in VANETs.- Evaluation of Performance Enhancement for Crash Constellation Prediction via Car-to-Car Communication: A Simulation Model Based Approach.- Aviation Issues: Performance Evaluation of an Ethernet-Based Cabin Network Architecture Supporting a Low-Latency Service.- Aeronautical Ad Hoc Network for Civil Aviation.- A DDS-Based Middleware for Cooperation of Air Traffic Service Units.- In-Car: Reliability Analysis of ZigBee Based Intra-Vehicle Wireless Sensor Networks.- Attack Potential and Efficient Security Enhancement of Automotive Bus Networks Using Short MACs with Rapid Key Change.- Infrastructures: Optimization for Wireless Vehicular Network System in Urban Area.- LTE Micro-cell Deployment for High-Density Railway Areas.- Live Video Streaming in Vehicular Networks.

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