What is the g0 phase of the cell cycle?

The G0 phase is the phase in the cell cycle in which the cell is neither dividing nor preparing for division; it's in a resting phase. The cell enters this phase after it is done dividing or duplicating (mitosis).

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.