A fast A class road that demands total concentration due to the traffic. You dont notice time or distance as you are totally "in the moment" Watching drivers eyes in their mirrors, any slight movement of the car, the side roads, pedestrians, dogs, roadworks, parked vehicles. No other thought enters your head. If there was no traffic one would just blast along the road at any speed one decides but the traffic makes it interesting. Testing the rider. Really enjoyable.