That area may take the form, for instance, of an open space of 50-metre radius having a central part of at least 20-metre radius which is practically level, surfaced with concrete, asphalt or similar material, and not covered with powdery snow, tall grass, loose soil or ashes.
Ta prostor je lahko odprt, ima premer 50 m in raven središčni del s premerom najmanj 20 m, površina je obložena z betonom, asfaltom ali podobnim materialom in ni prekrita s pršičem, visoko travo, zemljo ali pepelom.