Originally Posted by
KingAir1978
If I remember correctly from an aerodrome design manual that I've glanced over, a margin of 4,5 m on each side of the main gear is required to certify a taxiway. So, for example a Code E airplane has a maximum wheel base of 12 meters, thus requiring a taxi way that is 12 + 4.5 + 4.5 = 21 meters wide.
Yes, per Annex 14 the recommended margin for Code D/E/F aircraft is 4.5 m either side of the outer main gear.
For Code E aircraft (gear width < 14 m), the recommended taxiway width would therefore be 23 m.