A computer-implemented method and system for designing transportation routes, wherein design criteria to be met in respect of at least one of said transportation routes are supplied and route profile data are obtained showing land heights at sampled points along each of said at least one transportation route. Per-unit cost estimates in respect of land-cut and land-fill operations are supplied, and a height profile is computed of the at least one transportation route which meets the design criteria and for which the land-cut and land-fill operations are adjusted to give a minimum cost.
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