Which types of vehicle are required to have a device for protection against rear underrun collision?

1. AA freight vehicle, trailer and semi-trailer whose total weight is 3,500 kg or less.
2. BA freight vehicle whose rear overhang constitutes 60 percent of the axle distance.
3. CA freight vehicle, trailer and semi-trailer and work vehicle whose permitted total weight is more than 3,500 kg.
4. DAn articulated vehicle, a unified commercial vehicle and a combined vehicle whose total weight is more than 15,000 kg.

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