The document discusses adaptive cruise control (ACC) systems, which use sensors and controllers to maintain a safe distance from the vehicle ahead. It describes how ACC has evolved from conventional cruise control and now uses sensors like radar and LIDAR. ACC systems process sensor data to control braking and throttling. Cooperative ACC (CACC) allows vehicle-to-vehicle communication to coordinate speeds and braking more safely. While CACC promises increased safety and efficiency, its benefits require widespread adoption and it may encourage driver complacency. Researchers continue working to develop more advanced safety systems using sensors and vehicle communication.