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Densely deployed wireless networks is one of the most important solutions for spectrum shortage expected by 2020 with a huge economic impact. This paper proposes decoding schemes for high- dense vehicular multiway multirelaying (HDV-MWMR) systems comprising multiple multiway relays to serve huge number of users or devices. Due to the nature of huge number, instead of using perfect scheduling, we consider coded random access schemes, where all users transmit their messages uncoordinatedly. Although the transmission is random, the network structures still can be seen as codes-on-the-graph, resembling Low Density Parity Check (LDPC) codes structure, expected to provide an additional gain. The theoretical network capacity bound for HDV-MWMR systems exploiting multiple multiway relays is derived and confirmed via extrinsic information transfer (EXIT) chart analysis and computer simulations …