Abstract
Turn-delays in intersections contribute significant to travel
times and thus route choices in urban networks. However, turns are
difficult to handle in traffic assignment models due to the
asymmetric Jacobian in the cost functions. The paper describes a
model where turn delays have been included in the solution
algorithm of Sto-chastic User Equilibrium traffic assignment
(SUE). When the Jacobian is symme-tric, SUE minimises the road
users' 'perceived travel resistance’s'. This equals a probit-model
where the links cost-functions are traffic dependent. Hereby,
overlap-ping routes are handled in a consistent way. However, no
theoretical proof of convergence has been given if the Jacobian is
asymmetric, although convergence can be shown probable for model
data representing realistic road-networks. However, according to
the authors knowledge SUE with intersection delays have not prior
been tested on a full-scale network. Therefore, an essential part
of the paper presents practical tests of convergence. Both
geometric delays and delays caused by other turns are considered
for each turn. Signalised and non-signalised intersec-tions are
handled in different ways, as are roundabouts. In signalised
intersections a separate model handles queues longer than one
green-period. Green-waves can also be taken into consideration.
The model has been tested on a large-scale network for Copenhagen
with good results. To make it possible to establish the
comprehensive data, a GIS-based 'expert system' was implemented.
Original language | English |
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Title of host publication | Stochastic User Equilibrium Traffic Assignment with Turn-delays in Intersections |
Publication date | 1997 |
Publication status | Published - 1997 |
Event | Seventh International Conference on Informations Systems in Logistic and Transport - Gøteborg, Sweden Duration: 1 Jan 1997 → … |
Conference
Conference | Seventh International Conference on Informations Systems in Logistic and Transport |
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Country/Territory | Sweden |
City | Gøteborg |
Period | 01/01/1997 → … |