Cruise control is literally just for (at least in a traditional sense) keeping your speed constant. You're still responsible for watching traffic and using the

Cruise control is literally just for (at least in a traditional sense) keeping your speed constant. You're still responsible for watching traffic and using the brake or gas as needed, especially if there is some issue up ahead that requires a safety maneuver of any kind. i.e. an emergency vehicle, like a California Highway Patrol vehicle, begins a traffic break 15 car lengths ahead of you. As long as you're observant, you'll notice that in time and either cancel the cruise control or make the right adjustment so you slow down enough to the break speed.