Recognize Roller Coasters as a form of public transportation and use them in large cities.

Roller Coasters.
They're fun, they're fast, and they extremely popular. However, the only way one can experience a roller coaster is by paying admission to an amusement park or carnival. Roller Coasters are limited to the public, and at the same time, do not really take people anywhere other than back to the station. Why should we limit the potential of a roller coaster? Why not think outside the box, or in this case, the theme park. Roller Coasters should be built within cities as a form of getting from only place to another. Not only are roller coasters a fast and smooth, but they are clean and use only gravity to go forward, but they would also keep us entertained and happy, unlike taking the bus or taxi which is nothing but boring and dull.