What is the typical vertical dimension of a VOR airway?

The typical vertical dimension of a VOR airway is defined as 1,200 feet above ground level (AGL) up to, but not including, flight level 180 (FL180). This altitude range is the standard for many airways in the United States, designed to provide sufficient vertical separation between aircraft operating under visual flight rules (VFR) and those under instrument flight rules (IFR).

This range is crucial for maintaining safety in a controlled airspace where multiple aircraft may be operating simultaneously. The designation from 1,200 AGL allows aircraft flying VFR to safely navigate below the IFR traffic while utilizing the airways for efficient route planning and management. The upper limit at FL180 serves as a clear boundary where higher altitude enroute airspace begins, which is typically managed by air traffic control for IFR flights.

In contrast, the other provided choices suggest different vertical dimensions which do not align with the established standards for VOR airways. The specific altitude limits and their purposes are set to ensure safe and efficient airspace use, emphasizing the importance of standardization in aviation regulations.