Does any one have any experience of using Red / Green Lines to distinguish between PPE and Non PPE zones and if so, would you consider or have you ever consdered using a third 'amber' zone for PPE limited to, for example, Hi Vis only? I manage the H&S on a small biomass power plant and we use the Red / Green lines for the demarcation of PPE / Non PPE Zones, but we are considering introducing a third 'amber' zone where the wearing of HiVis the only requirement.  We have some roadways where we do not have the space to install purpose built footpaths.  We have a 10mph site speed limit and are considering painting dedicated footpaths and introducing this 'amber' zone where the only PPE required is HiVis jackets / waistcoats.  Has anyone got any practical experience of a three colour PPE zoning systems and could advise me on their experiences good and bad?