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Reliability is one of the key requirements for inter-vehicle communication in order to improve safety in road traffic. This paper describes the difficulties of inter-vehicle communication. The authors focus on an analysis of the state-of-the art MAC protocol draft IEEE P802.11p and its limitations in high load situations. For their analysis they consider a particular safety scenario: An emergency vehicle is approaching a traffic jam. In a simulation experiment, they highlight that severe packet loss can occur. The reliable transmission range can be reduced by up to 90%. The main reason for this degradation is interference caused by transmissions of other vehicles within the traffic jam.
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