My question is about WheelCollilder - vehicle not going straight

Hello everyone! I have the same problem in my game! I tried to do like this but I couldn't fix the problem! My vehicle not going straight! How can I fix that! You can also watch at this video!
When I press W and and my car is begining to go but in a few seconds my car is going left or right! It doesn't move in a straight line, but turns slightly to the left or right! Even I tried this from unity5 to unity2017! I can't fix this problem.

First video >>>

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Second video >>>

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Wheel colliders have always been this way.

nothing you can do about it.. if you need it to go straight youll need to introduce some ai steering behaviour

 

Hmmm..! I tried car game in the "Example Project" of unity and there were the same problem! But I saw in the gta and other games were not too much like this! How can I introduce "AI" steering behaviour and how can I connect this to my car controller? Can you tell?

 

But its not looking realistic