This paper seeks to clarify the expected approval process to be utilized by Contracting Parties concerning UN Regulation No. 131 which requires Contracting Parties applying UN R131 and UN R152 to recognise approvals to either Regulation as equally valid for vehicles of category M₂ and for those of category M₃/N₂ with a maximum weight below or equal to 8t and equipped with a hydraulic braking system.

Proposal to clarify the type-approval process concerning the reciprocal recognition of approvals to UN R131 and UN R152 (i.e., the conditions under which Contracting Parties applying both regulations are required to accept approvals under either regulation as equally valid for vehicles of category M₂ and for vehicles of category M₃/N₂ with a maximum weight below or equal to 8t and equipped with hydraulic braking).