Division 3.5.5.1
United Kingdom
For vehicles of category N that are approved as members of a vehicle family using the procedure in Section 3.6.2, the type-approval shall be extended to vehicles from within the same family only if the technical service estimates that the fuel consumption of the new vehicle does not exceed the fuel consumption of the vehicle on which the family’s fuel consumption is based.
Type-approvals may also be extended to vehicles which:
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are up to 110 kg heavier than the family member tested, provided that they are within 220 kg of the lightest member of the family,
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have a lower overall transmission ratio than the family member tested due solely to a change in tyre sizes, and,
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conform with the family in all other respects.,