Traffic safety comes first, and you must locate and design the driveway entrance to offer ample visibility. Be certain that you check with the town clerk for local regulations. But in a typical rural jurisdiction, the view from the driveway (its aspect ) must offer a clear view of oncoming vehicles for 500 feet in both directions on a highway carrying high-velocity (over 50 mph) traffic; and for 100 feet if it is a low-speed road.
To evaluate aspect, sink sticks at each side of your driveway entry so that their tops are four to five feet above the road surface. Measuring from the center of the driveway along the road, set one stick to your right on the far side of the road, and the other to the left on your side of the road. Check aspect as though you were sitting in a vehicle with its front bumper 10 feet back from the road edge. If you can remove trees or other obstructions to better see the stick tops and you can open a clear vista between them, get out the chain saw. If sharp curves, immovable terrain, or buildings preclude a safe aspect, then you’re going to have to redesign or relocate the driveway. If on a sharp curve, you may be able to widen or branch the entry, or you can build a one-way driveway across the curve to provide an acceptable aspect at each end. If you cannot come up with a suitable plan, you may need a variance. Again, go and see the town clerk. To read more follow the link below http://www.motherearthnews.com/diy/build-a-driveway-zmaz92aszshe