Many people call these Ribbon Lanes. Asphalt paving was way too expensive. Paving entirely in concrete was very cost prohibitive. Recycled Asphalt is not strong enough for this steep hill and not as durable as I need. I used large size gravel between and beside the lanes because the smaller 'packable' road pack tends to wash down the hill during storms. This heavier gravel doesn't pack but it doesn't need to and it does not roll down the hill. Of course this would have been easier to form it from the bottom to the top and bring in a truck but this was more fun and way cheaper.
