GAMAB
The GAMAB principle ( Globalement au moins aussi bon - generally at least as good ) means: A new system should be at least as safe and low-risk as any existing comparable system (see European rail standard EN 50126 , 1997).
This principle sets the current level of security as a minimum requirement. New systems must at least reach this level. The technical progress is thus developed step by step. It is based on the premise that the risk of the comparable system that is already in operation is accepted.
The principle is applied accordingly in the Railway Building and Operating Regulations EBO, §2 (General Requirements) Paragraph (2):
- Deviations from the recognized rules of technology may be made if at least the same level of safety as when these rules are observed has been demonstrated. (Proof of equal security)
In the chemical industry, the term “ best practice ” is used for this.
In France it is the common risk acceptance criterion.