Classifying routes on the Internerd Route System

So I have been finding a way to classify routes on the IRS (Internerd Route System. I have thought of this way to classify the routes.

A type routes- the normal routes. Normally 1 kilometer- 1.6 km long.

B type routes- Bypass routes and Beltway routes. They are for two or more cities which are very close to each other and are like twin cities, I guess.

C type routes- Connector routes. Connector routes are routes that connect many cities. Sort of like main routes, superhighways, etc.

To name a route, use a letter to determine which one it will be. Then type the number of the route as in the order of the route. ex: Route C12.