Re: Easily fixed...
This is a genuine problem at some airports. Runways are numbered according to the first two digits of their (magnetic) heading. Thus an East/West runway would be numbered "09" when landing toward the East, and "27" when the Westerly direction was in use. The numbers are written in large numerals at the threshold of the runway facing the direction of the landing aircraft. A runway with a heading of 20 degrees is thus "02" and its reciprocal is "20" When written in squared numerals it is very easy to look down and confuse which end is which, and end up landing in the wrong direction.