Phase Intergreens are important safety parameters which ensure sufficient clearance times between traffic starting and stopping at a traffic signal junction. They must be determined as part of a junction’s design process usually by considering the junction’s geometry and the paths taken by different traffic movements. In the UK phase intergreens are measured and calculated using the method described in the UK Traffic Signs Manual, Chapter 6. This involves determining conflict points between traffic movements and measuring relative distances traffic movements must travel to reach each conflict point from a scale drawing. UK Traffic Signs Manual, Chapter 6 can then be used to convert this information into intergreen values.
quickGreen assists with the calculation of intergreens by carrying out the repetitive conflict distance measuring work which is time consuming for a person to do but is easy for a computer. As well as speeding up the process of calculating intergreens it also reduces the likelihood of measurement or arithmetic errors, makes it very easy to check the intergreens and provides a convenient way of archiving the intergreens and the process by which they were calculated. Having calculated an intergreen matrix the intergreen values can be easily transferred to other software such as LinSig to carry out traffic signal calculations.
The quickGreen process for determining intergreens is as follows:
quickGreen can easily accommodate changes to Junction geometry. As lanes or turn paths are moved conflict distances and intergreens are instantly recalculated allowing the effects of changes to Junction geometry to be quickly evaluated.
quickGreen 2 provides similar functionality to quickGreen 1 but has been extensively rewritten to modernise and update quickGreen to be compatible with more recent versions of Windows and other software libraries and systems.
As part of this update the following have been improved:
quickGreen 2 has the following recommended system requirements:
Although quickGreen 2 can be used on a standalone laptop it is recommended that a separate larger monitor is connected to make working with larger Junctions easier.
Further information on quickGreen 2:
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