text: For many people, keeping a B average would not let people get nearly enough sleep to stay awake during their classes, and it is unreasonable to make them have a grade above passing if they participate in a school sport. Unless you want sleeping students in your classroom, and many upset students, don't make them keep a B average.Cars have been noted to be a big contributor to being a big problem to the enviroment. They are also known from stealing money from other means of transportation. Since people can just use a car people neglect the other means of transportation such as taking a bus and things of that nature. The advantages of limiting car usage is that it is betters the enviroment. It also economically better for other transportation. This is why limiting car usage benefit the world and the enviroment as a whole.