This is confusing, I feel like some of the points on each car shouldn't be there like the beginning. It felt like the fast car got extra points I don't know if I'm right or wrong
The highway is actually not difficult because the road obstacles don't change, but what makes the highway very difficult because the distance to get fuel is very far, so on the highway you have to need a vehicle that is super fast and fuel resistant because the fuel distance is very long.
