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News

SIDRA INTERSECTION 11.0.4 Out Now

22 Oct 2026 · News · 4 min read

SIDRA INTERSECTION 11 NOW AVAILABLE

Version 11.0.4 Now Available
Build 11.0.4.136, released 22 October 2026

A maintenance release for SIDRA INTERSECTION 11, with 12 enhancements and 16 bug fixes. The highlights:

  • The SIDRA API can now read and write SIDRA ASSIGN data.
  • The heavy vehicle adjustment in the HCM 6 Roundabout Capacity Model now matches the HCM specification.
  • Batch Convert can edit duplicate IDs in previous version project files.

Every change, including all 16 bug fixes, is on SIDRA DOCS →

SIDRA API NEW IN 11.0.4

The SIDRA API Can Now Read and Write SIDRA ASSIGN Data

A program you write can now build Assign Volume Bins, zones and O-D trip matrices, create Assign Networks, set up the assignment and read O-D, route and convergence results. Two new sample programs show how, in C#, C++ and Python. The API is included with your SIDRA INTERSECTION licence at no extra charge.

Read the announcement → About the SIDRA API →

Enhancements

What Has Improved

SIDRA API

  • API access to ASSIGN data has now been provided. See SIDRA ASSIGN in the SIDRA API documentation.
  • New data items and API access are added for the new "Source App" parameter in Properties dialogs to provide information about the data and program sources used to create and modify Sites and Networks in a Project file.

SIDRA ASSIGN

  • Assign Volume Bins now have LV and HV Movement Classes enabled always. This overcomes the issues that occurred if these classes were disabled.
  • When setting ASSIGN O-D Presets, clicking on a very fine line was required which needed too much precision for mouse use. The lines have been made wider to make this task easier.

Roundabouts

  • The SIDRA Standard Roundabout Capacity Model used under the US HCM - Metric and US HCM - Customary software setups is now referred to as "SIDRA Standard (HCM)" throughout the program.
  • Roundabout capacity values calculated in SIDRA using the US HCM 6 Roundabout Capacity Model option did not match exactly with values calculated using the HCM methodology. This was due to enhancements in SIDRA related to calculations by Movement Class (including Heavy Vehicles). These enhancements are no longer applied, and the Heavy Vehicle adjustment method used in SIDRA for the HCM 6 Roundabout Capacity Model replicates the HCM specification.

What this means. SIDRA Standard (HCM) is the SIDRA Standard model calibrated to match the HCM Edition 6 model; the new name makes that clear wherever it appears. Section 5.6 of the User Guide lists the other ways the HCM 6 / 7 model in SIDRA INTERSECTION can differ from a strict HCM implementation, such as applying capacity constraint to oversaturated lanes.

Signal analysis

  • Slip Lane movements with "Exclude Slip Lane from Signal Analysis" (Lane Geometry dialog, Lane Data tab), and U-turn movements with "Exclude U-Turn Before Intersection from Signal Analysis" (Movement Definitions dialog, Approach Movements tab) checked will not be taken into account in the determination of phase frequency. In previous versions, these movements were always considered.

What this means. Both options are checked by default. Movements you have already excluded from signal timing calculations are now left out of phase frequency too.

Interface and workflow

  • Software Setup names in the Manage tab, various Information and Properties tabs and in the SIDRA INTERSECTION installer have been enhanced to provide better clarity about whether metric or US Customary units apply.
  • Batch Convert now has options for editing any duplicate IDs found in previous version Project files. The IDs are changed during the conversion process using the option selected by the user.
  • Minor fixes and improvements to user interface.

Documentation

  • Additions to SIDRA Glossary including ASSIGN terms.
  • Improvements to User Guide and Help system.

Reprocessing a model in 11.0.4?

Several changes in this release can change results, for example the heavy vehicle adjustment in the HCM 6 Roundabout Capacity Model, phase frequency for excluded slip lane and U-turn movements, and several capacity and performance fixes. Reprocess affected models in 11.0.4 and check the results before you report them.

How to Update

From within the softwareSelect Check for Updates under FILE Tab > Software Info. The software will identify the more recent version and ask you whether to apply the update.
For IT departmentsDownload the latest installer using the route for your licence: SIDRA Downloads for FLOATING and Subscription licences, or your STORE Account for a 1PC licence. How to Download has the links. The current version does not need to be uninstalled.
Still on Version 11.0.1?Automatic updating did not work in Version 11.0.1 and was fixed in Version 11.0.2. If you are still on 11.0.1, download the latest installer and install it manually.
Licence agreement11.0.4 is covered by SLA Version 11.0.3, which is unchanged. Find the agreement for your version.

Full Release Notes

Read the Version 11 Update History

Every enhancement and bug fix in Version 11.0.4, alongside the complete update history for SIDRA INTERSECTION 11, is published on SIDRA DOCS. SIDRA API changes are in the API release notes.

View Updates →API Release Notes