The highways in France are usually good, but are ordinarily not excessively wide. The needs of the rapidly advancing armies, consequently, promptly put the greatest possible demands upon them. To ease this strain, main highways leading to the front were set aside very early in the advance as "one way" roads from which all civil and local military traffic were barred. Tens of thousands of truckloads of supplies were pushed forward over these one way roads in a constant stream of traffic. Reaching the supply dumps in the forward areas, the trucks unloaded and returned empty to Arromanches, Cherbourg and the lesser landing places by way of other one way highways. Even the French railroads were, to some degree, operated similarly, with loaded trains moving forward almost nose to tail.[7]
——For Want of a Nail: The Influence of Logistics on War (1948) by Hawthorne Daniel
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