So, everytime you slow down you need to go from 120mph to 0 under 3 secs? On that situation brakes are useful. When you need to go from 50mph to 30mph you dont

So, everytime you slow down you need to go from 120mph to 0 under 3 secs? On that situation brakes are useful. When you need to go from 50mph to 30mph you dont need brakes at all.