Connecting centroids to multiple sections
February 2023: Tessa Hayman explains different options for multiple centroid connections and the effects of different parameters and assignment algorithms.
How to define different costs per trip purpose in static models
January 2021: In Technical Note #53, we gave some tips on how to modify the cost for static assignment based on the vehicle type. In this month’s pro tip, Marga Delgado explains how to do it per trip purpose.
Static OD adjustment: the impact of weight function and gradient descent iterations
February 2019: Mohammad Saifuzzaman explores the use of adjustment weighting functions to improve the GEH and not just the R2.
Distribution and Modal Split Functions
January 2018: Margarida Delgado explains how the Distribution and Modal Split steps are now split into two separate processes to give you greater flexibility when choosing which model to work with, and to give you more control at each step.
How to use Matrix Contents
March 2017: Marga Delgado shows you how to use Contents to group matrices into subfolders, which is particularly convenient when working with multiple matrices.
Using bus travel times from a dynamic simulation for transit assignment
Use this approach for estimating the effect on distribution and mode split of operational changes in the transit system, such as the introduction of signal priority and reserved lanes along a corridor.
Defining a four-step model experiment
August 2014: Margarida Delgado explains the advantages of the chain structure of the four-step model experiment in Aimsun.
