Which Factor is Not One of The what factor is not a part of the Highway Transportation System

The factor which is not part of the Highway Transportation System is D. television stations. TV stations don't really have much to do with the transportation system at all - those are just programs that you watch on your TV when you are home. However, people, vehicles, and roadways do have a lot to do with highways and transportation - people drive vehicles on the roads in order to transport things.