Authors: P Moore Published: 12 Jul 2011


When designing a traffic signal junction perhaps the most fundamental and important design inputs are the phase intergreens. The accuracy of intergreens are important not just for providing safe clearances between phases when moving between signal stages but also in the overall efficiency of the junction. It should be self evident that inaccurate intergreens which are too short are unsafe, however, inaccurate intergreens which are too long lead to inefficient junctions and can also frustrate drivers leading to safety problems. This paper describes a new software tool – quickGreen – which helps signal engineers with the process of measuring, checking, archiving and auditing intergreens.
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