if the car has the ability to hit the brakes on its own when it sees another car in front of you, why can’t it do it when the car goes down an incline/exceeds a certain speed I don’t want to exceed?
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It could do that, but it would kill your fuel efficiency. Ideally you want to coast or engine brake any time you want to reduce speed, because you will travel further using energy that has already been burned.
Also the Toyota adaptive cruise system will use the brakes to prevent over speed, but it will first attempt to use lower gear first. This is because while you are coasting or engine braking you are moving without burning fuel.
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