Why isn't the car straight when following a curve? I have made this small animation with drivers with the help of this great community.
Unfortunately my cars are following the curves in one direction in a wierd way like this:

on a straight line i would have expected that the green car is exactly on the line...but it isn't. Can anybody tell me, why this happens? or how to make it right?
my settings:

blend file:
If you zoom on your curve, we can see that these 2 vertices are not aligned, it must mess the normals:


Align them on the Y axis and it will work fine. Also maybe add some vertices on this part to make sure the car will stay straight all along: