Mike Cantwell has built the famous Top Gear Test Track on Dunsfold Aerodrome in England. If you´re a follower of the British car TV-show you´ll instantly know what to to expect. Now you can join the likes of Richard Hammond and test your rFactor cars on the famous track.
Work on the track is not entirely done as some buildings, fencing and other stuff is missing. The track is still very well drivable though and includes a replay file to learn the track. Even though it sounds weird you should watch the replay to learn how laps are done on the airfield to get proper timed laps. The long airport runway is also an excellent place for high-speed tests.