New developments in Aimsun and future trends

Overview

• The integrated modelling philosophy• What’s new in Aimsun 8.2• New trends

Integrated modelling

MACRO

MESO

MICRO

Static assignment

Dynamic userequilibrium

or

Stochastic route choice

OD Matrix

Network data base

Path

s an

dpa

th fl

ows

data

bas

e

Traffic flow representationTraffic assignment

HYBRID

S

Role of network loading engines

Traversal OD Matrices & adjustment

DTA with DUE, paths assignment file

Detailed simulation,Pedestrians

New in Aimsun 8.2 – Demand forecasting• PT Crowding in cost functions

– Iterative Equilibrium process• PT Congestion Model

– Effective Frequency Model – Failure-to-board

• PT OD Adjustment– uses the equilibrium PT assignment

New in Aimsun 8.2 – Macro level

• Macro Dynamic– Presented yesterday

• Use of control plan– Macro static

assignment– Macro static OD

adjustment– TPF

New in Aimsun 8.2 – Meso level

• Initial state to start from– Decrease DUE time for long periods

New in Aimsun 8.2 – Dynamic Traffic Assignment• DUE New Gradient-

based method• DUE Path pruning• Incremental DUE• Use Rgap matrices

asinput• Output Rgap

matrices• Rgap for SRC

New in Aimsun 8.2 – Micro level

• Two-lane car-following model between adjacent sections

• Stop line adjustable• DUE Path pruning• Incremental DUE• Use Rgap matrices as

input• Output Rgap matrices• Rgap for SRC

New in Aimsun 8.2 – Interfaces

• SCATS ITS Data Port

• SCATS SRMS• SIDRA interface• VERSIT+

emissions and energy use model

New trends

• Improve usability of the integrated framework

• Activity Base Model with DTA

• Automated vehicles• Aimsun Online

applications• Peak spreading

techniques• Meso parallelisation