we have discussed the basics of qualitative model of transport

1. QUALITATIVE MODEL OF TRANSPORT
D.BALACHANDRAN

2. Transportation System
 Transportation System: Complex multi-dimensional
factors
 not easily determined, measured or estimated
directly

3. OBJECTIVE OF TRANSPORT
PLANNING & SIMULATION TOOL
 To represent with accuracy the underlying operation of
 the transport system
 (in terms of traffic conditions and travel patterns)
 To create reliable mathematical models for testing
 different / various schemes at the base year (underlying)
 or at future years (planning horizons )
 These schemes pertain to be at the supply (new
 infrastructure, new mode, pedestrialization of roads etc)
 or the demand (car pooling, flexible working hours etc)
 side

4. Transportation Models
and Benchmarking Evaluation
 According to the HCM (2000) a transportation model
is:
 “A computer program that uses mathematical models to
conduct experiments with traffic events on a transportation
facility or system over extended periods of time”

5. Transportation Models Classification:
 According to their application area
 * According to the level of presentation of the
traffic flows
 * According to the time period of the analysis

6. Transportation Models
Classification

7. Macroscopic Models
 Take into account transportation network attributes
 such as capacity, speed limit, flow and density
 Simulate large scale facilities (highways, regions etc)
 No need to track individual vehicles (aggregate theory)
 No detailed information about road design and signal
 plans is needed
 CUBE, TRIPS and VISUM

8. Mesoscopic Models
 Take into account the actual road geometry and signal
 timing plans
 Simulate intersections in a corridor or city
 Simulate individual vehicles
 Describe activities based on aggregate or macroscopic
 level
 SATURN, CORSIM, TRANSCAD, EMME/3, AIMSUN

9. Microscopic Models
 Simulate characteristics and interactions of individual
 vehicles
 Study area: Intersection or a road segment
 (e.g. a corridor )
 Enclose theories and rules for vehicle acceleration,
 passing manoeuvres and lane-changing

 PARAMICS, VISSIM, AIMSUN

10. CONCLUSIONS
 Mobility Management seems to be adopted more and
more by local authorities
 It is important to have accurate estimations about
the most promising MMM “before moving out of the
office”
 The classical transportation planning theory cannot
include qualitative parameters especially from the
behavioural – psychology side