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Abbreviation TDM

8 Feb 2020
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I am trying to plot a route for the Tour de Manche starting in Glastonbury. The route will be Glastonbury, Plymouth, Roscoff, Cherbourg, Portsmouth, Glastonbury. Any more detailed suggestions welcome.

Near Plymouth and Roscoff shown on the National and Regional routes is the abbreviation TDM. Does this stand for Tour de Manche? If so why is the marking not shown all the way along the whole of the round trip.