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Intersection Analysis Software
InterCalc is Traffic Engineering software developed by BA Consulting Group Ltd. in association with ITE District 7. The software provides a comprehensive and flexible evaluation of both Signalized and Unsignalized Intersections.

Consistent with the updated Capacity Guide for Signalized Intersections (2006 Edition), published by ITE District 7. The software is being released by the Institute of Transportation Engineers, District 7 (CITE) as the official software of the updated guide.

Signalized intersection analyses directly replicate the procedures in the ITE District 7 Capacity Guide for Signalized Intersections manual. Key features include the following:

  • Saturation Flow Adjustments: Detailed calculation of adjustments factors for saturation flow rates have been implemented as defined in the guide.

  • Worked Examples: Worked examples in the guide will be replicated in the software to clearly illustrate analysis procedures.

  • Automatic Signal Phase Classification: The program will identify any problems that may exist as a result of conflicting movements in the defined combination.

  • Pedestrian Crossing Requirements: Based on input crossing distances, the program will calculate minimum pedestrian crossing requirements and flag cases where they are not met.

  • Advance Phase Lost Time Accounting: Automatic adjustment of lost time and effective green time is performed on a lane by lane, phase by phase basis, taking into account the differing characteristics of left and through lane operations.

  • Demand Volume Balancing: Demand volumes are automatically balanced across any combination of exclusive and shared lanes, and through any phasing pattern, on each approach of the intersection. As a result, the user is not required to input any assumptions with respect to proportions of 'movements' in shared lanes.

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Consistent with the methodologies set out in the US Highway Capacity Manual (2000). Key features include the following:

  • Integrated with Signalized Analysis: Key traffic volume and lane configuration data are common to both analyses. This permits quick comparison of unsignalized versus signalized intersection performance.

  • Concise Reporting: Output results are formatted in a similar manner to those for signalized intersections. Report-ready printouts are easy to understand and adaptable for insertion into a master document.

  • Enhanced Lane Configurations: Intersection approach geometry supports evaluation of exclusive left turn lanes in addition to combinations of up to two through lanes.

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The integrated software package contains additional features to support complex and multiple analysis scenarios. These include the following:

  • Traffic Volume Calculator: Traffic volumes and growth factors can be entered and stored as layers, which can then be manipulated and combined arithmetically to simplify the process of managing multiple traffic analysis scenarios.

  • Project Based Scenario Management: Any number of intersections, and any number of analysis scenarios for each intersection can be easily created, analyzed, and saved in a single project file.

  • Easy to Read Reports: Comprehensive or single page summary reports are available, for all three intersection types.

  • Link to Synchro Software: Data files from Synchro (version 7 or higher) can be saved and imported directly into the InterCalc software.


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