"What would it take to build our way out of congestion in the Twin Cities?" was the question posed by
researchers five years ago. This previous study solved a roads-only network design problem (NDP) for
the Twin Cities of Minnesota. Building on that work, another network design problem is examined for the
Twin Cities metropolitan area of 3 million, to examine the tradeoff between demand side reductions and
the limited access capacity expansion necessary to achieve desired levels of service. The problem is
simplified by pre-determining a mode split, which allows for incorporating decreasing demand directly as
an input rather than in the model formulation. The problem is solved using Sequential Linear Expansion
(SLIE), a modified method of successive averages (MSA). Computation time for the large network is
decreased to a reasonable length using another modification, the MSA with decreasing re-initialization
(MSADR). A typical personal computer can solve this large-sized problem within 24 hours. For
forecasted travel demand for 2030, it was found that if the number of trips were reduced by 20%, lanemiles
needed to achieve LOS D decreases by up to 43%.
Davis, Gary A.; Sanderson, Kate; Tao, HunWen.
Capacity Expansion in the Twin Cities: The Roads-Transit Balance.
Minnesota Department of Transportation.
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