[EricH]

Originally Posted by dodar

So the safe zone is specifically the plastic on the field or is it the plane?

Originally Posted by Section 2

There is one Key for each Alliance, located in front of their opponent’s Alliance Wall. The Key is an elongated semicircle that is 101 in. wide and 48 in. deep. The flat edge of the Key is located 144 in. from the Alliance Wall and centered on the width of the Court. The Key is made of 1/8 in. thick red or blue HDPE plastic attached to the carpet via Velcro.

That's not a vertical plane definition.