  Researches have been devoted to making connected and automated vehicles
(CAVs) faster in different traffic scenarios. By using C-V2X or DSRC
communication protocol, CAVs can work more effectively. In this paper, we
compare these two communication protocols on CAVs in three different traffic
scenarios including ramp merging, intersection, and platoon brake. It shows
there is a trade-off between communication range and interval when leveraging
C-V2X or DSRC for CAVs. The result can help support further application designs
for CAV autonomously choosing communication protocols in different traffic
scenarios.
