This is the Take off run available (TORA) which is the physical
amount of distance on the ground for the aircraft to travel on and
lift off, plus a clearway if there is one. A clearway is an area of
an elevation of 1.25% gradient after take off in which there are no
obstructions, which are masts etc. This is the TODA or Take off
distance available. If there is no clearway then TODA will be the
same as TORA.