In document GRSG/2014/4, Hungary proposed to delete the provision that emergency windows shall be capable of being operated from outside the vehicle. This document provides a written justification for the proposal to enable its formal approval by GRSG.

Proposal to a) introduce requirements to prevent accidents when the flap covering the engine compartment is open; b) clarify that “low-floor vehicles” concern only those vehicles that provide a single step from the ground onto the low floor area; c) prohibit any equipment that would counteract the intention of such single-step low-floor vehicles to facilitate access by passengers with reduced mobility; d) clarify the text of the amendments updating provisions for service doors, windows and emergency exits; e) delete the prohibition on the use of laminated glass or plastic material in window panes; f) delete the provision that emergency windows be operable from outside the vehicle; g) clarify that an “overnight locking system” is not intended to be operated from inside the vehicle; and h) align the Annex 12 safety prescriptions for trolley buses with current electrical standards.

The newly introduced systems to detect excessive temperatures and/or smoke enable the driver to act immediately to ensure the safety of the passengers. This implies the possibility of braking, stopping, or some other response which could impact other road users. Therefore, this proposal would require the hazard warning lights to be activated (which will require consideration by the WP.29 Working Party on Lighting and Light-signalling Equipment). The proposal also proposes transitional provisions for the implementation of the new requirements.

Proposal to revise the text of document GRSG-107-25 on fire suppression systems to ensure that the provisions can be applied fully to natural gas and/or hydrogen-powered vehicles.