Visualisation of the state of roads on a map

I am designing a website with different kind of roads for bikers. I am looking for a way to show on a Google maps overlay what the state of the roads is. What is the best practice of this?

There are a few states, although with different names, but in its simplest form:

  1. High Quality roads
  2. Medium Quality Roads
  3. Low Quality roads
  4. under construction/usable soon
  5. under construction: being repaired

As you can see on the image below there are only 2 codes right now and different qualities can be shown on 1 road.

Screen capture

I appreciate every input!