Main supply route

A main supply route (MSR)[1] is the route or routes designated within an area of operations upon which the bulk of traffic flows in support of military operations[2] and humanitarian operations.

[3][4] MSR is a term that is also used in insurgency and irregular war scenarios.

[5] Because of the intense and predictable flow of constrained military traffic MSRs can often become targets for opposing forces, as was the case with the Airport Road in Baghdad, a short but dangerous route.

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A Hungarian Army truck on an MSR crossing the Sava river at Slavonski Brod, Croatia.
The infamous Route Diamond MSR, routing UNHCR aid into central Bosnia in the winter of 1993.