I am glad you like it, your comment just made my day!
It is possible to go West when you find the exit as it is on the same "line" as the other crossroads, so you're not crazy!
You actually can see the number of KMs on the road, next to your car, but it's true you no longer see it once you found the exit. Would it be helpful to add it on the map at the end?
Thanks again for playing my game!