you can punch it and go as fast as you car can go for a qr mile. in other words.. you can SAFELY run out 1-4th and some of us 5th before having to slow down. Now try that on the street and your going to have flashing blue lights behind you. Plus it gives you a time to show you how fast you got your car to go and at what MPH along with how good of a driver you are "your 60 foot"