That is a good looking drive avc. You have made a good start on it. Once you get it under control, it will be easier to maintain. When you have half a day you can spend clearing brush, think of it as getting to do it. Most people don't have the opportunity to clear their own long driveway.
We have a family reunion coming up down at our creek camp. [my avatar is a picture of our Ten Mile Creek land] My brother-in-law is having knee surgery, so it will fall to me to clear up the three lane road going in and a parking area near the camp. But it is all level ground, and the road is under the power lines. I will just be making it safe for the city cousins to drive and park their low cars. The only chainsawing I will have it cleaning up a blown down tree and a few bigger limbs.