SCU is about the work of the New Zealand police who establish the facts and causes of fatal road accidents .
It is on Saturday mornings from 08.00 to 09.00 on Really channel .
With a mathematical formula , they can calculate the speed of a crash.
When a car is skidding in a yaw position ,the angles are calculated to attain the speed at impact .
Skid tests are done in a police car with a skid computer to measure friction on the road surface .
We have the same thing here. The vehicle is adapted to take readings as the collision investigator jumps on the brakes