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How to calculate the speed of a vehicle from length skid?

To calculate the speed of the vehicle from the length of the skid, you need to use the formula:

```

Speed = √(254.3 * Skid Length)

```

where:

- Speed is in feet per second (fps)

- Skid Length is the length of the skid mark in feet.

Here's an example of how to calculate the speed of a vehicle:

- If a skid mark is 100 feet long, then:

- Speed = √(254.3 * 100)

- Speed = √(25430)

- Speed = 159.4 fps

- To convert fps to mph, multiply the speed by 0.682.

- Speed = 159.4 * 0.682

- Speed = 108.6 mph