Every day for four years, I would drive to my job, and every day at the same time, on the same route, I would notice the city bus. It would pull up next to me, and I would see all the people on board. Some would be reading. Some would be sleeping. Some would stare back at me. Every day, at the same time, it would follow me right to work. As I pulled into my parking space at work, I would see it around the corner, about a block away from my job. Then, one day, my car broke down. I had no way to get to work, and then, I remembered the bus. I decided to take it since I knew it was on the same schedule as I was. Since then, I have never driven to work again. Taking the bus is a useful method with which to travel because you can save a lot of money by using public transportation. One reason public transportation is useful is because it saves money. My commute to work was long, and it required a lot of gas. When I drove to work, I was spending $30 a week on gas. There are 52 weeks in a year. That translates to $1,560.00 a year I was spending on gas to get to work. When I started taking the bus, it cost $2 ($1 to get to work and another $1 to get home). Another way to save money is to use the toll road. That translates to $10 a week. That means that it cost me $520 a year to get to work. That's less than a third of what it cost to drive. It saved me $1,040.00. The funny part is that the reason my car broke down in the first place was because I was driving it constantly. 6 What is the central idea of this passage?