That statement is not entirely accurate. While the force of impact does increase significantly as speed increases, it's not as simple as a four-fold increase for a doubling of speed.

Here's why:

* Kinetic Energy: The force of impact is directly related to the kinetic energy of the vehicle. Kinetic energy is calculated as 1/2 * mass * velocity². This means that kinetic energy increases with the square of the velocity.

* Doubling Speed: When you double the speed, you quadruple the kinetic energy.

* Impact Force: While the force of impact is related to kinetic energy, it's not a direct linear relationship. The force also depends on the material properties of the objects involved in the collision, the deformation of the objects, and the duration of the impact.

Therefore, while the force of impact increases significantly when you double the speed, it's not precisely four times greater. It's more accurate to say that the force of impact increases exponentially with speed.

In conclusion:

The statement is a simplification. While the force of impact does increase drastically with speed, it's not a simple linear relationship. The actual force of impact is more complex and influenced by multiple factors.