| R55-12-03 | Working draft proposal to amend UN R55 with regard to vehicle combination applications | |
| R55-12-10 | UN R55: Proposal for restructuring provisions on vehicle combination applications | |
| R55-12-20/Rev.1 | UN R55: Proposal for restructuring provisions on vehicle combination applications | |
| R55-12-28 | Comments on the old Dutch couplings application |