Its a good point nev. Safety is driven by data and risk assessment. The old common sense rule has been replaced by quantitative evidence. A good example is the table in the report that shows the classification of ICAO runway incursion severity. Most of the incursions are in the lower risk category so Perth Airport could say there was nothing wrong with the position of J2 therefore money doesn't have to be spent to fix it. Once this incident put it into the significant risk category then the risk assessment matrix started to move into the red end of the likelihood and consequence box. Now the cost of potential litigation outweighed the cost of removing it The ridiculous part is all they had to do was alter the entry into J2 from runway 03 so that any aircraft had to slow to a normal taxi speed and the risk of incursion would be significantly reduced. Taxiway E2 off 05 in Adelaide shows how that could be achieved.