Unity 5 Standard Asset Car Waypoint AI problem with accuracy

Hello, I need help with Car AI in Unity 5, which is in Stardard Assets.

In my horror game drives a car with a player down the road in the woods. I used WaypointCarAI. My problem is that the car chasing points very inaccurately. How do I set up scripts so that auto intersected point exactly?

I have tried all the settings, but the car still chasing points imprecise.

The road is relatively flat and I need to put on the car to run on the right, but so did not depart from the road.

Can you help me please? I spend 2 days with this. And sorry for my bad english :) I am from Czech Republic