  This work gives introduction to traffic control by connected automated
vehicles. The influence of vehicle control on vehicular traffic and traffic
control strategies are discussed and compared. It is highlighted that
vehicle-to-everything connectivity allows connected automated vehicles to
access the state of the traffic behind them such that feedback can be utilized
to mitigate evolving congestions. Numerical simulations demonstrate that such
connectivity-based traffic control is beneficial for smoothness and energy
efficiency of highway traffic. The dynamics and stability of traffic flow,
under the proposed controllers, are analyzed in detail to construct stability
charts that guide the selection of stabilizing control gains.
