A completed corduroy road made by the German pioniertruppen was often settled in by running a tank or other heavy vehicle down it before the 'ribbon-cutting ceremony'. The guide rails on the edges were a standard fixture. Beneath the surface logs are at least five stringer logs running the length of the road surface. Depending on the depth of the mud it might require several layers of cross-laid logs. Ideally a layer of sand, earth, or gravel would be laid on the surface for a smoother ride.
Source :
Book "German Pionier 1939-45: Combat Engineer of the Wehrmacht" by Gordon L. Rottman
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