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We are excited to inform you that the latest major upgrade to SIDRA INTERSECTION is available now from our online store. This is a major new version that builds on Version 6.0 and brings forward some of the features which have been under development for Version 7.

Available in two versions - PLUS & NETWORK - these offer exactly the same functionality, except you can model up to 20 intersections with the NETWORK version. PLUS version you can model one or two intersections:

PLUS/1PC Version From $2580 AUD NETWORK/1PC Version From $3880 AUD

The main new features include the following:

//New and Improved Models

· New model for signal coordination effects using Signal Offsets and lane-based second-by-second platoon patterns including lane changes and platoon dispersion.

· New method for the program to calculate Extra Bunching values for roundabouts and two-way sign controlled intersections with upstream signalised intersections in Network analysis.

· In Network analysis, excess back of queue will be passed on to upstream continuous lanes to allow for queue blockage from a downstream intersection to apply to intersections further upstream.

· Pedestrian Actuation method for improved signal timing calculations when pedestrian volumes are low.

· Phase Actuation method for improved signal timing calculations when vehicle volumes are low.

· Improved delay calculations for movements in shared lanes at two-way sign controlled intersections and roundabouts including shared continuous and opposed movement lanes.

· New model for the effect of opposed turns in Major Road short lanes at Two-Way Sign Control Sites on the capacity and performance of the adjacent through (continuous) movement when there is overflow from the back of the short lane.

· Significant enhancements to handling of two-segment lanes including cases when the two segment lane is treated as a short lane.

· Cost model parameters updated.

//User Interface Improvements

· Network Layout display with detailed geometry as in Site Layout pictures.

· Improved Site Layout diagrams.

· Multiple Site and Network selections for opening or printing reports and displays, and for various user interface functions (Process, Clone, etc).

· New Staged Crossing and Merge templates.

· The processing time for Sites and Networks and program memory usage for large Networks improved significantly.

· User Guide and Help system finalised.

SI-7 Progress

We are pleased to inform you that the work on SIDRA INTERSECTION Version 7 (SI-7) development has been progressing well - with almost all major new functions implemented. We will be using Version 7 as well as the current Version 6.1 in the forthcoming training workshops in Sydney and Brisbane so as to teach the new software features mostly related to network modelling.

The major new features of SI-7 include the following:

  • ROUTES for performance reports and displays, and for signal Offset calculations.
  • Network output by Routes.
  • Network CYCLE TIME calculations.
  • SIGNAL OFFSET calculations.
  • Common Control Groups (cycle time and green split method for multiple Sites controlled by a single controller).
  • HCM 2015 roundabout capacity model option.
  • Larger number of User Movement Classes.
  • Various user interface improvements including Route Output Comparison and Network Output Comparison by Routes.
  • Various model improvements.
  • We will keep you up to date with the progress.  For US users, we will give more information about the "HCM 2015" roundabout capacity model option in Version 7 in due course.

IMPORTANT: Please remember to keep your COVER up to date since you will get a free upgrade if your COVER is not expired at the time of this new major version release.


SIDRA INTERSECTION features a unique lane-based micro-analytical Network Model, incorporating all types of intersection and diverse Movement Classes. Lane disciplines (exclusive and shared lane arrangements) and all movement data are specified, and all lane flow calculations, capacity and performance estimation and signal timing calculations are carried out by Origin – Destination movements and Movement Classes. This is the biggest change in the 30+ year history of the software.

SI-6 User Interface (Std Left) - Site Layout & Phase Sequence SI-6 Network Configuration Dialog (Std Left) - 4 Site Closed Network SI-6 User Interface (US) - Site Layout & Delay Control SI-6 Network Layout & Network Summary Report (US)


SIDRA INTERSECTION employs a lane-based network model allowing all intersection types - signals, roundabouts, sign control in one network. Backward Spread of Congestion (queue spillback) resulting in capacity reduction at upstream lanes, and Capacity Constraint reducing the demand volumes of downstream lanes as a result of oversaturated upstream lanes are powerful features of this model.

Lane Movements are used to model blockage of upstream lanes depending on lane choices of movements from approach lanes to exit lanes. Upstream and downstream lane flows and mid-block lane changes determine platooning on an approach.

Networks are easy to configure using SIDRA INTERSECTION Sites.

4-Site Closed Network. Network Display - Degree of Saturation (Std Left) 4-Site Closed Network Network Flows Dialog (Std Left) 3-Site Network, Network Display - Speed efficiency (US) 3 -Site Network, Network Flows Display (US)


Light vehicles, heavy vehicles, buses, bicycles, large trucks, light rail/trams as well as two user classes - with different vehicle characteristics - can be allocated to different lanes, lane segments and signal phases. This provides a unique method for modelling of Bus Priority Lanes, Bicycle Lanes, and so on.

Bus Priority Lanes & Signals (Std Left) Bicycle Lanes (Std Left) Bus Priority Lanes & Signals (US) Light Rail (US)


Data and modelling by Origin-Destination (OD) Movements allow improved handling of movements at intersections with diagonal legs and U turns.

Lane Geometry Dialog (Std Left) Output Displays (Std Left) Lane Geometry Dialog (US) Movement Out Report & Display (US)


  • New model for signal coordination effects using signal offsets and lane-based second-by-second platoon patterns including lane changes and platoon dispersion.
  • Variable phase sequence analysis.
  • Bus priority and other special vehicle signals using new Movement Class method.
  • Pedestrians at signals:
    • New features include slip lane crossings, diagonal crossings (for all-pedestrian phases) and more flexible pedestrian staged crossing arrangements.
    • Pedestrian Actuation and Walk Time Extension features.
    • Automatic calculation of Extra Start Loss values for Opposing Pedestrian effects.
    • Improved pedestrian performance equations.
  • Easy phase sequence data specification.

Phasing & Timing Dialog (std Left) Signal Timing Output (Std Left) Movement Timing Diagram (US) Phase Sequence Display (US)


SIDRA INTERSECTION is the most advanced software for roundabouts.   Many  powerful model features have been introduced in recent versions:

Roundabout corridors can be analysed in detail using the new network model.

Program will calculate Extra Bunching values for roundabouts (also for two-way sign controlled intersections) with upstream signalised intersections in Network analysis.

Roundabout geometry:

  • Raindrop design
  • Strip islands (between lanes)
  • Wide splitter island in roundabout layout picture
  • User-specified inscribed diameter and number of downstream circulating lanes

Circulating lane flows: improved model of unequal circulating lane flow rates for bunching calculations, and circulating lane flow rates given in the Detailed Output report.

"Set as Dominant Lane" for user control of how the dominant and subdominant lanes are determined.

"Include Slip/Bypass Lane in Entry Lane Count" for user control of how slip / bypass lanes are handled.

"Percent Opposed by Nearest Lane Only" for specifying conditions where some traffic gives way (yields) to the nearest circulating lane or exiting lane.

Origin-Destination Factor: model improved to make allowance for lane flow balance of lanes on the dominant approach.

HCM 2010 roundabout capacity model: improved calibration method introduced.

Circulating & Approach Lane Flows (Std Left) Roundabouts Input Dialog (US) Roundabout Corridor with Signals (US) Raindrop Roundabout Input Dialog (US)


The new two-way sign control method adjusts gap acceptance parameters automatically for intersection geometry and control, with option to apply reduction with opposing flow rate. The new model of opposing stream headways includes the effect of unequal lane use of opposing (major) stream lanes on minor stream capacities. A new parameter Percent Opposed by Nearest Lane Only is used for specifying conditions where some traffic gives way (yields) to the nearest opposing (major road) traffic lane.

The two-way sign-control model includes the effect of pedestrians on vehicle movements.

Two-Way Sign Control Layout (Std Left) TWSC Calibration Dialog (Std Left) TWSC Opposing Flow Effect (US) TWSC Gap Acceptance Data Dialog


Two-segment lanes (with different Movement Classes allocated to individual segments), contra-flow lanes, strip islands, high-angle and low-angle slip / bypass lanes allow more flexible and powerful lane geometry specification.

Site Layout (Std Left) Lane Configuration (Std Left) Site Layout (US) Lane Configuration (US)


A good understanding of traffic operations at intersections is essential for effective use of traffic models for intersection design and traffic planning purposes. Model calibration is an important element of this process. Our SIDRA INTERSECTION workshops are not just about intersection analysis, but aim to improve general understanding of operational analysis of all traffic facilities.

Visit our TRAINING section to view SIDRA INTERSECTION workshop dates, detailed information and registration. Contact the Sales Department if you need further information.

We have representatives who run training workshops in other countries. They are supported by Akcelik & Associates for providing up to date training programs. See our list of Representatives

Please let us know if you are interested in future training workshops in your area by filling out and submitting this Workshop Interest Form.

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