Demand system :
Set of cars, mobility choices, households, etc.
o
Supply system : Roads, parkings, railways, etc.
Transport System Analysis
A method used for studying the impact of the change in the transport system:
1- Definition of the study area a.
Definition of plan area: Zone directly influences but the changes
b.
Definition of Study area (belt/border = study area – plan area): zone
indirectly influenced by the changes
2-
Zoning : Discretization of the territory into traffic zones where movements
take place. For this, physical separators can be used (like rivers), and also the
dimension of the discretization varies according to the density of trips. Then
the centroids of the zones are used for O/D
3-
Selection of base network: Definition of infrastructure/services that are
relevant for the studied problem
4-
Definition of components of relevant transport demand Transport models: network and graph
For the model of the transport infrastructure, oriented graphs are used, composed
by links and nodes. Each link has associated a
flow and a
cost . There is the intra-
periodic stationarity (in different time of the day, or day of the week, depending on
the model, the flow is assumed to be stable).
Passing through a link implies a cost in time, money, and discomfort, which gives
place to the
generalized cost of transport .
Two vectors describe the cost and flow:
vector of costs of link , and
vector of costs of flows :
ICT4TS – Exam summary
12
Link-route incidence matrix and additive cost
Expresses the relation among links and routes in a graph.
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