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The Cooperative Intelligent Transportation System (C-ITS) testbed or simplified called the Smart Highway (Antwerp, Belgium) is designed to facilitate research in the area of distributed/edge computing and vehicular communications. The Smart Highway testbed deploys the Cooperative Awareness Basic Service to exchange Cooperative Awareness Messages (CAMs) between road C-ITS entities, e.g., C-ITS vehicles and Road-Side Units (RSUs). CAMs support vehicular safety and traffic efficiency applications by providing them with the continuous status information of relevant C-ITS entities. Therefore, it is important that those messages are delivered with low latency, especially the CAMs that originate from special vehicles, e.g., emergency vehicles, police cars, and fire trucks. In this paper, we research the impact of CAM messages configuration on the communication latency among vehicles. Moreover, we have performed the practical experimentation to evaluate the aforementioned impact, using ITS-G5 and LTE-V2X system under realistic vehicular conditions, on the Smart Highway testbed located in Antwerp.

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Current research in Cooperative Intelligent Transport System (C-ITS) is focusing mostly on improving the performance of the link layer technology utilized to enable communication between cars or on methods to make traffic more efficient and, most important, safer. Less attention is instead devoted to non-motorized road users such as pedestrians or cyclists which are often addressed as Vulnerable Road Users, or VRUs. In fact, while today it is fair to assume that the vast majority of VRUs are equipped with a smartphones or in general with devices with wireless connectivity, we cannot also assume that such devices are compatible with the variant of the 802.11 standard employed in C-ITS applications known as 802.11p. This is a significant gap in that it prevents critical safety services available to vehicular road users to be extended also to VRUs.In this paper we propose an edge computing-based approach capable of enabling interoperability between 802.11p networks and standard Wi-Fi networks. A technique known as Beacon stuffing is utilized to forward such messages to the VRU's mobile devices without requiring them to be associated to any network. The proposed system can be easily integrated into off-the-shelf mobile phones and tablets without requiring any root access to the device. We prototype and test the proposed system over the Smart-highway Testbed deployed in Antwerp, Belgium.