Transport network design land use Road network design
Szeto, W.Y., Li, X. and O'Mahony, M, Time-dependent road network design frameworks with land use consideration: policy implications, Procs of the 87th Annual Meeting of the Transportation Research Board, Washington D.C., January, CDROM, 2008, CDROM-
In the past, transport network design focused on the effect of designs on the transport system
alone but not on the land use system, and ignored the land use-transport interaction over time.
This may result in obtaining suboptimal designs. Additionally, the impacts of road network
improvement policies on the land use system, especially the benefit of landowners cannot be
evaluated without considering the interaction. With these considerations, this paper proposes
optimization frameworks for road network design considering the land-use transport interaction
over time. Unlike existing models, the optimization frameworks can determine the optimal
designs automatically without trial-and-error once the objective(s) is/are clearly defined.
Moreover, these frameworks allow the evaluation of the impacts of the optimal designs on the
related parties including landowners, toll road operators, transit operators, and road users, and
help network planners and profit-makers with decision-making by eliminating many alternative
designs. A numerical study is set up to examine road network design’s effects on these related
parties under three road network improvement schemes: exact cost recovery, build-operatetransfer,
and cross-subsidization (using the increase in transit profit to subsidize road
improvement projects). The results show that the changes in landowner profits are not the same
after implementing any scheme. These unequal changes raise the issue of the landowner equity.
If the government guarantees the occurrence of this equity without providing any subsidy,
societal benefit can decrease and the road network can become more congested. This implies that
the government has to consider tradeoffs between parties’ objectives carefully.
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