I rendered the scene again, with the following slope map for the terrain:

 slope {-y}
 color_map
 {
  [0 color rgb <046/255,104/255,058/255,>]
  [0.0625 color rgb <139/255,117/255,102/255,>]
  [0.0625 color Gray]
  [0.125 color Gray]
 }

The problem areas are around the road where the terrain is particularly
steep. They are nearly vertical. They should be completely gray. Why isn't
the slope map being applied properly to these areas?

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