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  • Windows 7 or above

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Optimised Signal Capacity and Delay

Prediction of capacities, queues, delays at isolated signalised junctions

OSCADY is available as the Signalised Intersection Module in Junctions 9 (v9.5 or above)

The OSCADY model calculates capacities, queues and delays for isolated (uncoordinated), traffic signal controlled junctions. It can evaluate a set of known signal timings, and optionally it can optimise stage lengths and/or cycle time to minimise delay.

The signal optimiser in OSCADY is stage-based, but signals data is set up by allocating phases to traffic streams and then adding stages in a similar way to TRANSYT 15. (In fact signals data can be copied and pasted directly between the two programs.) Stages and stage sequences can be generated automatically, based on phase allocations and an Intergreen matrix.

OSCADY is intended to be used at relatively simple signalised junctions where the emphasis is on setting up model runs quickly and easily, but can model junctions that include flared approaches and opposed right turns. It shares the same user interface as ARCADY 9 and PICADY 9 which means that it is possible to switch a junction between priority and signalised options and compare the results within one package. Data input such as traffic demand OD matrices takes the same form as that used by the ARCADY and PICADY modules in Junctions 9. Other tools such as reports, analyser tools, junction diagrams and file handling will also be familiar to users of Junctions 9.

Optionally, signalised junctions can be evaluated in Lane Simulation mode, which allows some additional functionality such as the ability to model intermittent stages and partially signalised junctions including signalised roundabouts.

Basic junction structure and signals data can be exported to TRANSYT 15. In this way a file can be started using OSCADY 9 and then transferred to TRANSYT 15 should there be a need to use the more advanced features available in TRANSYT.