Route friction is the accumulated drag that makes movement slower, riskier, costlier, or less reliable than map distance alone would suggest.
Friction can come from terrain, weather, border procedure, escort demand, unloading delay, institutional clearance, or the need to transfer between movement layers.
Route friction is what turns a route map into an operating map. Two paths may appear equally short, yet one repeatedly fails because its transfers are slow, its escort needs are heavy, or its institutions add too much drag.
This matters for corridor design, campaign planning, urban supply, and migration analysis. A corridor hardens not only because it exists, but because its friction stays low enough to preserve repeated use relative to alternatives.
Route friction is not the same thing as distance, ticket price, or one dramatic hazard. It is the accumulated drag of all the small burdens that make one route less reliable or more expensive to sustain under repeated use.
If a supposed substitute route exists on paper but actors still avoid it under pressure, ask what friction term is being ignored. The answer is often customs delay, convoy exposure, seasonal unreliability, or a hidden transfer bottleneck rather than pure geography.
Queues, repeated handoff loss, escort dependence, and institutional clearance delay are common signs that the route is losing viability through friction rather than through absolute closure.
A shorter road through a border post may still be worse than a longer coastal detour if customs drag, unloading delay, and convoy risk make the nominal shortcut harder to use repeatedly.
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