So basically the red cars have totally random parameters and the other types of cars (yellow, cyan and navy) copy the parameters of the car that has gone the furthest yet and change the values of those parameters up or down by a notch (10, 1 and 0.1 %).
If you wanna learn more about how to create the neurons network, I greatly advise the video by 3blue1brown on the subject.
Good Luck !!!