In life, we can't be too choosy or we might find a job at all. While you are able to secure a job as a truck driver, there is no guarantee that the truck that you would be driving is top of the line, meaning new. That is just it, we need to stick with it since we are just a driver and we complain too much, we might hurt the feeling of our boss and might become the reason for firing us. Of course, we don't like that to happen especially, when there are lots of people looking for a job and your boss could easily get someone to replace you.
As a truck driver, you need to ensure that the cargo are always delivered on time. If you lose one of the cargoes then you would need to handle the cost of it. That won't be a pleasant experience, especially, your salary is not that bog. If you complain too much then you would be sure that you would get yourself fired and be out on the street looking for another job. Looking for a job is not a pleasant experience since everyone wants a job that would help them get fed all the time.
In this game, the idea is to deliver the cargo on time. Take note that you need not to lose any cargo since it is very limited and a single cargo could mean you not be able to finish the game. In short, the game would have ended immediately if you lose a cargo. It is important to not lose any cargo since you would definitely fail the game if that happens even if you reach the finish line on time. The game gets more challenging as you make some progress.