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INTERSECTION
- Introduction
- Overview
- New Features
- System Requirements
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- SIDRA for HCM
- Roundabouts
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SIDRA INTERSECTION Software for
Highway Capacity Manual (HCM 2000)

SIDRA INTERSECTION for Highway Capacity Manual (HCM 2000)

SIDRA INTERSECTION software complements Highway Capacity Manual (HCM 2000) as an advanced intersection traffic analysis tool. Using SIDRA INTERSECTION, you can evaluate alternative treatments involving signalized intersections, roundabouts, two-way stop and give-way (yield) sign-control, all-way stop sign control, single-point urban interchanges, signalized midblock crossings for pedestrians, all in one package. Intersections with up to 8 legs, each as a two-way road, one-way approach or one-way exit. The Highway Capacity Manual version of SIDRA INTERSECTION offers options for US Customary and Metric units.

For more general information on Highway Capacity Manual (HMC 2000) see pages in our Resources section.

Highway Capacity Manual (HMC) version of SIDRA INTERSECTION

SIDRA INTERSECTION is compatible with the US Highway Capacity Manual (HMC) . However, unlike some software packages available in the USA, the HCM version of SIDRA INTERSECTION does not claim to be a simple replication of the HCM procedures. This means that:

• Generally (for all types of intersection), SIDRA INTERSECTION uses more advanced models and methods, including lane-by-lane analysis rather than analysis by lane groups, modeling of short lanes, detailed modeling of geometric delays, and the use of drive cycles (cruise, acceleration, deceleration and idling) for detailed modelling of delay and travel time components as well as operating cost, fuel consumption and emission estimation.
• The HCM version of SIDRA INTERSECTION is based on the calibration of most model parameters using the HCM defaults as applicable.
• SIDRA INTERSECTION includes various configuration options to allow the user to choose between the HCM and standard SIDRA model options, e.g. the HCM Delay and Queue model options.
• Some HCM models or methods are used in all versions of SIDRA INTERSECTION , including the HCM Level of Service method and criteria, the delay and queue progression factors, and All-Way Stop Control (AWSC) analysis method (the SIDRA AWSC model is currently based on the HCM 1994 edition, and there are some differences between the SIDRA and HCM two-way stop control models).
• The HCM 2000 single-lane roundabout model results are included in SIDRA INTERSECTION output for comparison with the SIDRA INTERSECTION standard model for roundabouts.
• For signalised intersections, in addition to the general features mentioned above, the use of two green periods for modeling slip lanes, Right Turn On Red (RTOR) and permitted-protected left-turns provides more accurate capacity estimates.
• The HCM and SIDRA INTERSECTION capacity and performance models are compatible in their basic structures and principles (e.g. the HCM back of queue model for signalised intersections was derived from the SIDRA INTERSECTION model), and although SIDRA INTERSECTION is a much more detailed model than the HCM, SIDRA INTERSECTION works like a more advanced version of the HCM by incorporating the HCM defaults in its HCM version.

The following paper on the HMC version of SIDRA INTERSECTION was published previously:

AKÇELIK, R. (1990). SIDRA for the Highway Capacity Manual. Compendium of Technical Papers, 60th Annual Meeting of the Institute of Transportation Engineers, pp. 210–219.

Some aspects of this paper are outdated due to the changes introduced in later editions of HCM and the adoption of those changes in SIDRA INTERSECTION.

Detailed explanations related to all aspects of the HCM version of SIDRA INTERSECTION are included throughout the User Guide.

HCM 2000 Back of Queue Model in SIDRA INTERSECTION

The signalised intersection chapter of the HCM 2000 edition of the US Highway Capacity Manual (TRB 2000, Chapter 16) has introduced a back of queue model, which was developed by Rahmi Akçelik.

The HCM 2000 back of queue model for signalised intersections is available in SIDRA INTERSECTION as an alternative to the standard SIDRA INTERSECTION back of queue model. The two models are based on the same modelling methodology and give close results. A paper by Viloria, Courage and Avery (2000) presented detailed discussions on the HCM 2000 model and compared it with the SIDRA INTERSECTION and various other queue models for signalised intersections.

The HCM Delay and Queue model options in SIDRA INTERSECTION will cause delays and queues for signalised intersections and two-way stop-sign control to be calculated using the HCM equations regardless of the model setup chosen. Otherwise, the standard SIDRA INTERSECTION delay and queue equations will be used in all cases. For further information, refer to the SIDRA INTERSECTION User Guide.

Reports by Akcelik and Associates (see references below), presenting detailed discussions on the HCM 2000 back of queue model, are available in the Downloads page.

References

TRB (2000). Highway Capacity Manual. Transportation Research Board, National Research Council, Washington, D.C., U.S.A. ("HCM2000").

VILORIA, F., COURAGE, K. and AVERY, D. (2000). Comparison of queue length models at signalised intersections. Paper presented at the 79th Annual Meeting of the Transportation Research Board, Washington, D.C., U.S.A.

AKÇELIK, R. (2001). Progression Factors in the HCM 2000 Queue and Delay Models for Traffic Signals. Technical Report. Akcelik and Associates Pty Ltd, Melbourne, Australia.

AKÇELIK, R. (2001). HCM 2000 Back of Queue Model for Signalised Intersections. Technical Report. Akcelik and Associates Pty Ltd, Melbourne, Australia.