The road can be dangerous if you don't know what you are doing. You can have an accident anytime soon, so you need to be careful while driving. But, in a post-apocalyptic world filled with violence, gangs are constantly roaming on the road and they would target anyone that they see on the road. This make it impossible to travel from one place to another. And this is the same reason, why you need to arm yourself, so you can defend yourself. It is not safe anymore to drive on the road because some people would just kill you for it.
Your ultimate goal is to get to the finish line, but it would take a lot of time before you can do that. For now, just focus on driving your car to as far as you can go. You would earn money from the distance you travel and from the enemy kills. Use the money to buy other vehicles and some upgrades as well. The road ahead is tough as there are gangs waiting for you and would not hesitate to kill you at all. Kill them the moment that you see them, since they are going to do the same to you. You need to hit them with everything you got to be able to last long in this game.