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.
