Axis / car safe separation distance

It is common knowledge to keep a safe distance from the car in front of you. This distance is about half the speed of the vehicle. But the problem is how far apart from the vehicle in front of you is the so called “Safe Distance? ”Axis”is a smart supporting device for driving. It will inform you clearly how far apart you should stay with the vehicle in front of you. ” Axis” is a transparent window that applies the vanishing point of the principle of perspective. Objects of different distances will have the corresponding size. A safe distance can be easily determined by marking the size of the vehicles within the safe distance.