How transportation is measured affects the perceived value of different modes. Different modes play different roles in providing mobility For example, nonmotorized modes serve shorter-distance trips and motorized modes serve longer- distance mobility. Some modes are more suitable for people with physical disabilities or low incomes. Some modes are particularly important for industrial activity.
Standard transport statistics indicate that in North America more than 90% of households own an automobile, and more than 90% of trips are made by automobile, while only about 5% of trips are made by nonmotorized modes and less than 2% This suggests that private vehicle travel is by far the most important form of transport, and that improving other modes can do little to address transport problems.