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.