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Release Notes

This is a summary of the key changes in subsequent patches for version 24 of the Aimsun Next environment.

24.0.2

Improvements

Microscopic simulation

Static assignment

  • To take into account priorities when calculating conflicting volumes for supernode trajectories, two changes have been done:
    • The user-defined conflicts table in the supernode trajectories has been reintroduced.
    • The conflicting volume for supernode trajectories is now calculated taking into account stop and yield signs.
  • Turns with actuated control with recall = no now compute their minimum green time by adding the minimum green times of the phases that serve them, as if they are not skipped. In previous versions they got a minimum green time of 0, which may produce errors in the evaluation of the TPF.

Performance

  • The option to delete temporary columns has been extended to include the external columns that are not created by Aimsun. It is highly recommended to delete columns that are no longer in use, as these columns will be otherwise consuming unnecessarily memory, space and loading time resources.

Signal optimisation interfaces

User Interface

  • OD Matrix Editor -> Cells tab: Click on a centroid in the 2D View to select the corresponding row in the matrix, Ctrl+Click to select the column.

Bug Fixes

  • Crashes when importing some Real Data Sets or when simulating with grouping outputs have been addressed.

24.0.1

Improvements

Microscopic simulation

  • When using the Fast Forward mode in a simulation with animation, the context clock and the active view mode are now updated during the simulation.
  • In the simulation animation, traffic lights are visualized at the end of the section, inside the section, and they have a fixed depth. When simulating bicycles with Non-Lane-Based behavior, they will not stop before the traffic light area but rather on it.

Mesoscopic simulation

  • Cost functions that access Control Plan information now are also available in mesoscopic simulations (previously they were only available for Hybrid Macro-Meso and Simplified Meso).

Pedestrians

Copy and paste

  • Copy and paste of geometrical objects has been improved to make it faster.
  • The option to duplicate meterings is now available and complete.

Bug Fixes

View Modes

GTFS Import

  • In subnetworks, when a Transit Line exits and re-enters the subnetwork, it was not automatically splitted into different lines covering the different segments, now it is.
  • When importing the transit stops of the line, sometimes the same transit stop was assigned to the line more than once. Now this is checked and transit stops are used only once per line.
  • Now it is no longer required to have a calendar.txt file in order to import from calendar_dates.txt.

OSM Import for Roundabouts

  • The number of lanes in roundabouts was not always correct when importing from OSM - now the number of lanes is correct.

Subnetwork Duplicates

  • When duplicating a Subnetwork from the Project window, all its subfolders and objects will also be duplicated.

Data Comparison

  • For variables whose aggregated value (whole simulation interval calculated from individual interval values) is weighted by count, the Data Comparison tool was only calculating the mean value. Now it is also weighted.
  • Comparison of shorter common intervals and their means for results that have different intervals has been corrected.

Mesoscopic simulation

  • Delay Time Meterings defined per lane now are correctly taken into account in mesoscopic simulations.
  • Multiple Delay Time Meterings defined in the same section now are correctly taken into account in mesoscopic simulations.
  • Flow Meterings logic is now correctly taken into account in mesoscopic simulations.

Pedestrians

Static OD adjustment

  • When using Centroid Groupings the calculations where taking too long, now threads are used to speed up the process so that no computation delay is experienced.

Time Series

Initial State

  • Issue solved when trying to store a Initial State during simulation.