Change default speed params for a car

[m.shostakovsky 0]

Hello,

I wont change the default speed settings for the car.

In DZ\vehicles\wheeled\config.cpp I found next code:

class CfgVehicles
{
  ...
    
	class Truck_01_Base: CarScript
	{
  		...
    
		class SimulationModule: SimulationModule         
  		{ 
              drive="DRIVE_662"; 
              centralDiffRatio=2.1500001; 
              airDragFrontTotal=0.80000001;

              class Steering 
              {
                  increaseSpeed[]={0,25,50,15};
                  decreaseSpeed[]={0,50,50,40};
                  centeringSpeed[]={0,25,50,15}; 

              };
          ...
        }
      ...
    }
  ...
}

I don't understand how arrays: inceaseSpeed, reduceSpeed and centeringSpeed - work. What is the logic behind them?I can assume that the elements of the array are tied to the gears: inceaseSpeed[0] - 1st gear, inceaseSpeed[1] - 2nd gear, inceaseSpeed[2] - 3rd gear, inceaseSpeed[3] - may be reverse gear.

The question is how do they interact, array elements among themselves and arrays among themselves? 
Can I see how this is implemented in the native code?
What should I be guided by when creating a class of my own car?

Thanks in advance for helping me with this issue.