Describe the differences between the four major types of roads

According to your question that ask to describe the differences between the four major type of roads and in my own understanding and research, I would say that the difference of the four is that first, their names are given according to their location and uses, Second, they are also classified as the number of object or people that goes with it. Hope this help 

Answerglycogen;

Answerequatorial guinea,gabon, and western sahara;