Lane-based traffic assignment for critical network locations
New in SIDRA INTERSECTION 11 — SIDRA ASSIGN brings micro-analytical traffic assignment to the SIDRA Network model, launching March 2026. Model Route selection between Origin and Destination Zones using O-D trip demand data. Five assignment methods including Stochastic User Equilibrium — only available in SIDRA ASSIGN. Integrated with the detailed lane-based multimodal SIDRA Network model, capturing queue spillback, lane blockage effects and signal timing. Multimodal analysis by Movement Class for Light Vehicles, Heavy Vehicles, Buses, Bicycles, Large Trucks and Light Rail. Ideal for corridor studies, interchange assessments and Traffic Impact Assessment. Free upgrade for COVER subscribers.
Micro-Analytical Traffic Assignment Powered by the SIDRA Network Model
Introducing SIDRA ASSIGN — a unique micro-analytical traffic assignment functionality integrated with the detailed lane-based multimodal Network model provided in the SIDRA INTERSECTION software.
SIDRA ASSIGN models Route selection between Origin and Destination Zones, estimating intersection movement volumes from an O-D trip demand matrix while accounting for network-wide traffic interactions and detailed intersection capacity and performance estimation at the lane level.
SIDRA ASSIGN helps with assessing traffic management schemes that may result in Route changes — an important addition to the capabilities of SIDRA INTERSECTION as a popular Traffic Impact Assessment tool.
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Lane-level, not link-level
SIDRA INTERSECTION 11 with SIDRA ASSIGN is now available. Visit sidraintersection.com for product information.
Where conventional macroscopic analytical traffic assignment tools use link-based models that have difficulty in treating intersection delays , SIDRA ASSIGN works at the level where congestion actually occurs — individual lanes where capacity, delay, queues and stops are modelled in detail . The result is Route travel times (costs) that capture the effects of lane blockages on upstream lane capacity reductions and the resulting constraint on downstream arrival flows. These features of the SIDRA Network model integrated with detailed modelling of intersection capacity and performance, and with signal timing algorithms for intersections, interchanges, corridors and networks provide a unique micro-analytical traffic assignment tool in a single software environment.
SIDRA ASSIGN is suited for small-to-medium Networks — the critical areas where the detailed lane-based Network model determines the quality of the traffic assignment process and the resulting output.
What SIDRA ASSIGN Delivers
Traffic assignment with detailed intersection modelling
SIDRA ASSIGN uses Route travel times determined from detailed analysis of intersection delays using the SIDRA lane-based Network traffic model as an integral part of its assignment calculations. This captures the traffic interactions — capacity constraints of oversaturated lanes and backward spread of congestion (queue spillback) due to lane blockage — that link-based macroscopic assignment tools cannot replicate.
Full model fidelity
SIDRA ASSIGN makes full use of the SIDRA micro-analytical intersection and Network models. It does not apply any simplification to these models due to the high processing efficiency of the SIDRA analytical models.
Multimodal Route choice analysis
Unique traffic assignment by Movement Class : Light Vehicles, Heavy Vehicles, Buses, Bicycles, Large Trucks, Light Rail/Trams and six User Classes are available. Routes are formed by connecting Network Site Movements for each Movement Class, allowing for Fixed Route specifications by the user in a powerful way.
Analyse critical Networks using O-D data
You can now use the micro-analytical SIDRA Network model for detailed analysis of critical Network areas using Origin-Destination (O-D) Trip Matrix data from macroscopic strategic planning software. SIDRA ASSIGN will determine movement volumes using time-proven models for all types of intersections, interchanges and pedestrian crossings (signalised, roundabout, sign control) in one software.
Network templates for complex configurations
Special application to enable easy use of pre-built SIDRA Network Templates to model paired intersections, interchanges, two-stage crossings, and alternative intersections and interchanges. SIDRA ASSIGN will determine internal approach movement volumes.
Integrated performance reporting
All standard SIDRA INTERSECTION Network outputs — including capacity, level of service, delay, queue length, stop rate, signal timings, fuel consumption and emissions — are available as part of the SIDRA ASSIGN results. SIDRA ASSIGN outputs include approach movement volumes by Movement Class, Trip Performance Reports, Trip Route Displays, Fixed Route Displays and Movement Displays by O-D Pair.
Five traffic assignment methods
Select the method that matches your project requirements:
Fixed Routes can be used in conjunction with other assignment methods which is useful in representing Buses, Trams, Trucks or Bicycles. The modeller also has the option to include static background approach movement volumes in traffic assignment.
- 01
Stochastic User Equilibrium (SUE)
Equilibrium assignment with probabilistic Route choice preferences based on drivers' different perceptions of travel times (costs).
- 02
User Equilibrium (UE)
Deterministic assignment to implement Wardrop's first principle: no user can reduce travel time by switching Routes.
- 03
Fixed Route Assignment (FRA)
User-defined Route volume proportions for known Route choice patterns.
- 04
Incremental Assignment (IA)
Progressive loading of demand volumes to observe congestion build-up.
- 05
All-or-Nothing (AON)
Baseline loading to the lowest travel time (cost) Route.
Designed for Critical Network Areas
SIDRA ASSIGN is purpose-built for the Networks where intersection-level detail matters most:
For corridor studies , interchange assessments , paired intersection analysis , area-wide traffic management schemes and any network where Route choice interacts with intersection performance, SIDRA ASSIGN provides the analytical precision that link-based macro tools and manual methods cannot match.
Also New in Version 11
Model & Data Enhancements
User Interface Improvements
Model & Data Enhancements
Enhanced Network Convergence Method
An improved convergence method for the SIDRA Network model delivers more reliable results for complex network configurations.
Assign Volume Bin in the Volume Store
The Volume Store now includes the Assign Volume Bin for managing O-D trip demand data used by SIDRA ASSIGN. Assign Volume Bins store Zone definitions, O-D Volumes by Movement Class, growth rates and Fixed O-D Volumes, and can be shared across multiple Assign Networks within a project.
Cost Parameter Updates
Updated cost parameters for fuel consumption, emissions and economic analysis.
User Interface Improvements
Exit Cruise Speed Display
Exit Cruise Speed is now shown in the Site Movement Display for easier review of movement parameters.
Ribbon Split Styles
Refined visual styles for ribbon command button split layouts, providing a cleaner and more consistent interface.
FLOATING Licence Interface
An improved interface for managing FLOATING Licence connections and status.
User Report Templates
An enhanced interface for creating and managing User Report Templates.
Right-Click Menu
New right-click menu options to open and close popup displays for faster workflow.
Ready to get started?
Contact your authorised SIDRA Reseller to purchase or upgrade to SIDRA INTERSECTION 11.