| To ensure that safety signs are clearly recognisable, their colours have been given standardised definitions in ISO 3864-4. |


| The size selected is key to determining from how far away the sign can be recognised. The further away the sign must be recognised, the larger the safety sign should be. |


| Fire protection and rescue signs with long-lasting luminescence are used if there is no safety lighting or if the general lighting fails.
The following factors affect luminescence:
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| In practice, there are many ways to indicate potential dangers at the workplace. Choosing the right material is essential to ensure longevity and prevent a safety sign from becoming damaged. |


















































