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Powerful New Features in SI-8

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The following is a summary of the new features of SIDRA INTERSECTION 8.

More Powerful and Efficient Processing

Substantial increases are achieved in computing speeds for the iterative network analysis method enabling introduction of facilities for optimum timings as well as demand and sensitivity analysis for networks. Average computing speeds about 5 to 10 times faster than previous versions can be expected in Network analysis.

Increased efficiency of database operations have also been achieved and memory management enhancements have been introduced.

Enhanced User Interface

Significant user interface improvements introduced for ease of use of the software include:

  • graphical displays of Layout, Volumes, Phase Sequence and Movement IDs within most Site input dialogs for assisting the input data entry process and allowing direct in-display data entry;
  • various commands that were hidden in right-click menus in previous versions made available in the Site / Network / Route ribbon or in Site Output sections;
  • right-clicking an output report or display to open the relevant Site / Network / Route input menu and some display commands;
  • double-clicking Site / Network / Route name to open the relevant layout picture;
  • modified processing icon animation according to the new structure for Network model iterations;
  • where Network parameters override Site data, no need to process the Network again if any of the corresponding parameters are changed in Sites that constitute the Network;
  • improved Import Volume Data function;
  • simplified Volume Data Settings for Pedestrians;
  • various improvements in the CCG Phasing & Timing and the Network Data dialogs;
  • cancelling processing of multiple Sites and Networks;
  • option to include or exclude suffixes (Copy, Conversion, Import, Reversed) when Clone, Import, Convert, Reverse functions are used for Sites, Networks, Routes and Sequences;
  • improved Zoom Slider including a dialog to set exact zoom values.

Better Output Reports and Displays

These  have been enhanced significantly. New Site, Network and Route output reports and displays include:

  • Project Summary report using the new Site Category and Network Category parameters;
  • User Report facility based on user-defined report templates;
  • enhanced Input Comparison and Output Comparison facilities using results from different Projects;
  • Lane Changes, Lane Flows, Network Flows and Midblock Flows displays for the whole Network with pop-up boxes showing demand and arrival flows by movement class;
  • Approach Distances display for Networks;
  • Numerical values shown in all Network and Route Displays;
  • Signal Coordination displays in the form of Lane Displays for Sites, Networks and Routes, and Movement Displays for Sites;
  • Route Travel Performance report;
  • Saturation Flows report for signalised Sites;
  • Critical Movements display for signalised Sites with a phase - movement timings bar display and an ARR 123 style critical movement diagram;
  • Movement Timing display for Common Control Groups (CCGs) showing all movements of the CCG together;
  • Gap Acceptance Cycle Parameters included in the Sign Control Analysis and Roundabout Analysis reports.

Significant Network Model Improvements

Important model improvements have been made including:

  • Optimum Cycle Time for Networks;
  • Optimum Cycle Time and Optimum Maximum Green Settings for Common Control Groups;
  • new Phase Time calculation options;
  • improved treatment of Uncoordinated and Unconnected Sites for signal timing calculations;
  • Network Demand and Sensitivity analysis methods for design life, flow scale and parameter sensitivity;
  • Queue at Start of Green and Average Number of Cycles to Depart for signalised Sites;
  • enhanced methods used for stopping conditions in Network and Site model iterations with Network Model Variability Index and Site Model Variability Index parameters given in various output reports and displays;
  • improvements to the iterative method used for Site capacity and timing analyses resulting in fewer cases of unsettled results.



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  • analyse a large number of intersection types including signalised intersections
    (fixed-time / pretimed and actuated), signalised and unsignalised pedestrian crossings, single point interchanges (signalised), roundabouts (unsignalised), roundabouts with metering signals, two-way stop sign and give-way / yield sign control, all-way stop sign control, give-way / yield sign-control and merge analysis;
  • analyse any network with up to 20 Sites including roundabout corridors, a mixture of signalised intersections, roundabouts and sign control, and so on;
  • using the network model, analyse paired (closely-spaced) intersections including staggered T intersections, freeway signalised diamond interchanges, freeway roundabout interchanges, fully-signalised roundabouts (including signalised circulating roads), large signalised intersections with wide median storage areas, staged crossings at sign-controlled intersections, pedestrian crossings near intersections, and alternative intersection and interchange configurations such as diverging diamond interchanges (signalised), continuous flow intersections, restricted cross street U turns, and so on;
  • use diverse movement classes including Standard Movement Classes (Light Vehicles and Heavy Vehicles, Buses, Bicycles, Large Trucks, Light Rail / Trams) and User Classes to analyse bus lanes and phases, bicycle lanes and phases, the effect of heavy vehicles on intersection capacity and performance, and so on;
  • obtain estimates of capacity and performance characteristics such as delay, queue length, stop rate as well as operating cost, fuel consumption and pollutant emissions for all intersection types;
  • analyse many design alternatives to optimise the intersection and network geometry, signal phasing and timings specifying different strategies for optimisation;
  • handle intersections with up to 8 legs, each with one-way or two-way traffic, one-lane or multi- lane approaches, and short lanes, slip /bypass lanes, continuous lanes, turn bans, U turns, contra flow lanes as relevant;
  • determine signal timings (fixed-time / pretimed and actuated) for any intersection geometry allowing for simple as well as complex phasing arrangements;
  • carry out a design life analysis to assess impact of traffic growth;
  • carry out a parameter sensitivity analysis for calibration, optimisation, evaluation and geometric design purposes;
  • design intersection geometry including lane use arrangements taking advantage of the unique lane-by-lane analysis method of SIDRA INTERSECTION for individual Sites and Networks;
  • determine short lane lengths (turn bays, lanes with parking upstream, and loss of a lane at the exit side);
  • analyse complicated cases of shared lanes and opposed turns (e.g. permissive and protected phases, slip lanes, turns on red);
  • analyse oversaturated conditions making use of the time-dependent delay, queue length and stop rate models used in SIDRA INTERSECTION. 

In using SIDRA INTERSECTION, you can:

  • prepare data and inspect output with ease due to the graphical nature of SIDRA INTERSECTION input and output, and use extensive templates supplied with the software;
  • obtain output including capacity, timing and performance results reported for individual lanes, individual movements, movement groupings (such as vehicles and pedestrians), and for the intersection and network as a whole;
  • obtain network displays for graphical representation of network performance;
  • use options to set up output reports and displays;
  • in your reports, present your data and results in picture and graphs form;
  • carry out sensitivity analyses to evaluate the impact of changes on parameters representing intersection geometry and driver behaviour;
  • calibrate the parameters of the operating cost , fuel consumption and emission models for your local conditions allowing for factors such as the value of time and resource cost of fuel;
  • set User Setups for default systems that reflect your local traffic conditions;
  • use Excel VOLUMES and ANNUAL SUMS utilities provided using the SIDRA INTERSECTION Application Programming Interface.

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