  Recent developments in advanced sensors, wireless communications and
intelligent vehicle control technologies have enabled vehicles to detect
traffic anomalies on the road and then notify surrounding vehicles to improve
traffic safety. However, due to the high-speed movement of vehicles and the
frequent topological changes between vehicles, it is difficult for vehicles to
evaluate the credibility of received messages. Quite a lot of research effort
has been carried out to establish various trustworthiness platforms. These
studies mostly focus on how to enhance the accuracy of credibility evaluation,
overlooking that the transmission performance may affect the quality of vehicle
messages. In this paper, we aim to support the improvement of credibility
evaluation in vehicle networks by enhancing the transmission experience of
vehicles. The proposed solution utilizes the vehicle's trajectory information,
detection range and a roadside unit (RSU) coverage to form a controlled number
of detection zones, which guarantees that events can be detected and reported
while limiting the number of transmission vehicles. Furthermore, our scheme
takes account of vehicle credibility and interference ranges when selecting
reporting vehicles, supporting the timely and reliable delivery of vehicles'
event reports when accidents occur. Our ns2 evaluation shows that our scheme
can greatly reduce delay and loss rates of vehicle messages to help existing
studies on accurate vehicle credibility evaluation.
