|Size Code||Sign Dimensions||Poor Light||Good Light|
|G||300 x 100mm||6.6M||11.8M|
|L||450 x 150mm||9.5M||17M|
|M||600 x 200mm||14.3M||25M|
The above table shows maximum viewing distances in 'good' and 'poor' light conditions. These are a guideline only - please refer to BS ISO 3864-1: 2011 for specific calculations. You can also download a copy of the Health and Safety Executive's "Safety signs and signals" document by clicking here.