One thing which is constant in this rapidly changing world is the increase in population. With population increase comes the widening of habitat and increase in the demand of other basic human needs. One of the crucial human needs except for food, water, and shelter is transportation. We have reached that stage wherein even if a person owns a car, he prefers to use public transportation or cabs in order to avoid the inconvenience caused by growing traffic. Personal cars are now kept aside only for weekend outings. Even cabs are not fe...