This document provides guidelines for safe fuelling operations of vehicles that use liquefied natural gas (LNG) as a fuel for propulsion, covering the activities and procedures to be followed for safe operation. It provides procedures applicable to different fuelling systems and technologies. NOTE The document has been based on the consideration that it is the employers duty to protect the health, safety and welfare of the employees (as organized in Directive 89/391 EEC). As such, it is considered to be the responsibility of the driver s employer to ensure that LNG vehicle drivers are properly trained.