| An active subject of debate in the Twin Cities of St. Paul and Minneapolis concerns the extent to which new highway construction can accommodate the growth in travel demand expected over the next 20–25 years. These researchers investigated the feasibility of using new highway construction as the sole accommodation to the Twin Cities’ projected growth. This was accomplished by solving for a set of expansions of the capacities of freeway segments that, after accounting for the tendency of drivers to divert to faster routes, minimized the land needed for new freeway capacity, while guaranteeing speeds of about 60 mph during the morning and afternoon peak periods. Since the road network model for the Twin Cities contained 1,200 zones and over 20,000 links, this was a very large-scale nonlinear optimization project, but by exploiting the problem’s special structure, it was possible to find a numerically efficient solution procedures. Overall, “Building Our Way Out of Congestion” would require about 1,150 additional lane-miles of limited-access roadway. This represents an expansion of about 70% over the current system. |  Year 2020 minimal capacity expansions needed to guarantee essentially uncongested speeds during morning and afternoon peak periods. |
Katherine Sanderson, Graduate Student Researcher
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