Correct Example [#1328]
Stony or rocky ground which is hardly passable (less than 20% of normal speed).
Gallery
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Stony ground with speed reduced to less than 20% of normal speed near Doizieux, France. Photo by: Luděk Krtička (CC BY-SA 4.0)
Stony or rocky ground which is hardly passable (less than 20% of normal speed).
Gallery