A follow-on "why" might be: "Why will visibility on the ramp be degraded?" The answer might be there is inadequate lighting on certain segments of the ramp area whrer a collision might occur. Another "why" might be "why is there insufficient lighting" The answer might be that funding is not available or tha airport Master Plane dose not call for extra lighting or certain area, which may lead to deceding the hazard is "insufficient ramp lighting" (Figure 9-2 illustrates the preceding example.)