Again from Mr. Root, Boeing Aircraft:
• 45m is standard runway width (for most large
commercial jet operations)
• As of March, 2002, there were at least 63
airports worldwide with runway width 30m or
less, being served by 737,757 or 767 aircraft
• Boeing has received various requests from
operators for guidance in operating aircraft on
runways as narrow as 23m (75 ft)