Emergency Lighting BS 5266-6 1999 (GB)
This part of BS 5266 contains the code of practice for non-electrical low mounted safety wayguidance systems for emergency use - photoluminescent systems. Some extracts are quoted below:
"A low mounted way guidance system should be designed to ensure that the escape route is clearly marked with a visible "line of light""
"The escape route corridors should be indicated by a line of markers on both sides of the escape route. When the escape route crosses an open area, the location of the route should be indicated by two parallel lines of route marker