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DSRC builds on the existing Institute of Electrical and Electronics Engineers (IEEE) 802.11 p physical (PHY) and medium access control (MAC) layers, while LTE V2V/V2X develops on top of the 3 rd Generation Partnership Project (3GPP) LTE standard. While both DSRC and LTE V2V/V2X are considered as candidates for future 5G and autonomous driving uses, these vehicular radio communication technologies exhibit differences, in particular with respect to spectrum access management. Similar to its underlying IEEE 802.11 p origins, DSRC uses a contention-based channel access scheme where vehicular communication devices and supporting network access nodes, known as Roadside Units (RSUs), compete for access to a shared channel in a distributed manner.