How does car move and how fast does a car go

Air causes greater resistance at increasing speed. The faster you go, the more air you are moving in a given amount of time. Air resistance to automobiles increases progressively with speed. Aerodynamic design that reduces wind resistance increases car speed.

the answer is; comparing the frequency of collisions with and without the device

this makes the anti-collision system an independent variable and the collisions a dependent variable. if there are fewer collisions with an anti-collision system that without, then it can be stated that the system is a success. essentially, collisions under an anti-collision system are compared with the frequency of collisions by cars with the human drivers.