long radius exit
high-speed taxiway (HST)
A long radius taxiway designed and provided with lighting or a marking to define the paths of aircraft, traveling at high speed (up to 60 knots), from the runway center to a point on the center of a taxiway. The high-speed taxiway is designed to expedite aircraft turning off the runway after landing, thus reducing runway occupancy time. Also called a long radius exit, high-speed exit, high-speed turnoff, rapid exit taxiway, or turnoff taxiway.