Victor airways

Victor airways are Class E airspace from 1,200 ft (366 m.) above ground level (AGL) to 18,000 ft (5485 m.) mean sea level (MSL). These virtual airways are defined primarily by VORs, and comprise a system of established routes that run along specified VOR radials, hence the beginning letter V (see NATO Phonetic alphabet).

The width of the victor corridor depends on the distance from the navigational aids (such as VORs and NDBs):

When VORs are less than 102 NM (189 km) from each other, the Victor airway extends 4 NM (7.4 km) on either side of the center line (8 NM (14.8 km) total width).
When VOR's are more than 102 NM from each other, the width of the airway in the middle increases. The width of the airway beyond 51 NM from a navaid is 4.5 degrees on either side of the center line between the two navaids (at 51NM from a navaid, 4.5 degrees from the centerline of a radial is equivalent to 4 NM). The maximum width of the airway is at the middle point between the two navaids. This is when 4.5 degrees from the center radial results in a maximum distance for both navaids.