1. 1. Lower airways are 30 KM (16NM) wide, growing narrower at a distance of 100 KM (54NM) away from a marked fix, reaching a width of 15 KM (8NM) over it.

2. 2. Lower airways between two radio aids, far from each other up to 100 KM (54NM), shall be 20 KM (11NM) wide along their entire length.