In anticipation of improvements to truck-cab aerodynamics, this proposal would update Part III of UN R93 where the front under-run protection is integrated in the motor vehicle by defining the forward reference point as the same transverse location where the force is applied. This results in FUPs that, in the case of cab fronts that are curved, at least 400 mm must be maintained along the front contour of the cab, instead of the foremost point.

Proposal to update Part III of UN R93 to enable approval of truck cabs where the front underrun protection is integrated in the motor vehicle (in order to improve aerodynamic performance). This proposal would define the forward reference point as being the same transverse location where the force is applied. This results in FUPs where (in the case of cab fronts that are curved) at least 400 mm must be maintained along the front contour of the cab, instead of the foremost point. The proposal includes transitional provisions from 1 September 2020.

Proposal to update Part III of UN R93 to enable approval of truck cabs where the front underrun protection is integrated in the motor vehicle (in order to improve aerodynamic performance). This proposal would define the forward reference point as being the same transverse location where the force is applied. This results in FUPs where (in the case of cab fronts that are curved) at least 400 mm must be maintained along the front contour of the cab, instead of the foremost point. The proposal includes transitional provisions from 1 September 2020.

Proposal to modify the scope and transitional provisions of the proposal concerning aerodynamic cabs.

Revisions to the proposal to update Part III of UN R93 to enable approval of truck cabs where the front underrun protection is integrated in the motor vehicle (in order to improve aerodynamic performance). The proposal includes transitional provisions from 1 November 2025.

The text was prepared by the expert from the European Commission (EC) to update and amend the provisions on Frontal Underrun Protection (FUP), to extend to more vehicle models the safety and aerodynamic benefits from the recent evolution of cab (flexibility and rounded shape)

Proposal to amend requirements for front underrun protection devices to address aerodynamic body configurations.

List of items approved during the remote GRSG July session but subject to confirmation via absence of objections following the session. Under the “silence procedure”, if a Contracting Party expresses dissent, the GRSG approval is nullified.