• Diesel mode maintained in the D-F system
• Emissions: ECE/EU regulation must be met
• Noise levels at original ECE/EU levels
• Diesel engine governor unchanged
• Safety: approved within UNECE R.67 and R.110.
• ‘System family’ of components are tested; some more than once.
• Inspection & Approval like bi-fuel retrofit vehicles
• Final approval by local departments of Ministry of Transport

Discussion
• Rules under R.115 apply
• No rules for gas energy ratio (GER). Measurement is gas and diesel