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Wireless Access in Vehicular Environments (WAVE) is comprised of multiple IEEE standards, including 1609.1 through 4 and 802.11p. In this paper, a testbed implementation of the 1609.3 and 1609.4 standards will be discussed. GNU Radio and the USRP version 1 will be used to implement a 802.11p-like physical layer, the application management of 1609.3, and the channelization features of the 1609.4 draft which are unique to the WAVE stack. This implementation is meant to provide a testbed for testing communication between multiple single transceiver WAVE devices. GNU Radio allows us to easily modify different layers in the protocol stack as the drafts continue to be standardized and its modularity allows us to easily breakdown the complex WAVE stack into manageable pieces. While it should be possible to implement a standard-compliant version of 1609.4 (and above) with GNU Radio, only a low bitrate version of the physical layer can be implemented due to communication limitations between the processing PC and the USRP.