Where is V15 and how do I find it? My question: Where is V15 and how do I find it?

The question referred to in the practice test:


  Refer to the figure 21, area 2 below: What is the floor of controlled airspace along V15?


The correct answer was 1200 ft AGL.





I want to thank @757toga, and @JScarry for the help on this. I made an 88 on my Drone certification that I took today (10/11/2018)
There is a notation for V15 (low altitude IFR airway) in the southern portion of the top map in your question.



V15 is a Federal Airway, normally used for IFR operations and shown on IFR charts as well as VFR Sectionals. Federal Airways, unless otherwise notated, begin at 1200 AGL. These airways are Class E airspace. If you look in the legend of your Sectional Chart it describes this airspace.