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Allocation of flows throughout networks is a common problem in transport research, yet there are very few computational tools available, and almost no open source tools. We describe a new software package, "dodgr" (Distances On Directed GRaphs) capable of extremely efficient flow aggregation over millions of routes within a network. This package represents a much needed advance in transport research, enabling aggregation at the finest scales of individual street segments, with results able to be direcly viewed with modern web-rendering and interactive viewing tools such as deck.gl.
Mark Padgham (Mon,) studied this question.