Perspective Available Airport Runway (P.A.A.R), Visual Functional Approach

Slope upwards for visual depth perception for moving object like humans on the surface or smart aviation devices in the height are more recognizable than slope downwards, because the environment and sides of road, path or airport runway are more catchable and more available to receive for viewers; for instance, when you go mountain, the target for eyes and visual perception in brain is near and vision sees everything nearer and depth perception is perspective and more familiar.Therefore, if airport runway and the sides including buildings and airport accessories builds towards slope upwards from the beginning of half -length i.e., in which slope upwards starts from the ۱۰۰۰m means half-length of a runway with ۲۰۰۰ms. length; so, the height slope at the end of runway should be ۱۰m. and also, the airport runway bandwidth should be twice from the beginning of the airport runway bandwidth.If we attend to the below expressions in aviation which related to airport runway all of them have the word of ‘available’, for instance TORA: Takeoff Run Available, TODA: Takeoff Distance Available, ASDA: Accelerate-Stop Distance Available, LDA: Landing Distance Available, and EMD: Emergency Distance Available; the question of this article is ‘how can the pilot recognize the perspective of runway is ‘available’?