Proposal to amend UN R174 supplement 1 to the 01 series of amendments. Modifications include clarifying folding seat exemptions from safety-belt reminder requirements, deleting requirement that first level warning activation depend on transmission neutral position, harmonizing “vehicle master control switch” definition with UN R159, ensuring drivers receive initial warnings when entering vehicles with remotely activated switches, enabling clear voice communication during emergency calls, extending application to vehicles of category X, and accommodating vehicles without driver and manual driving controls and those equipped with Automated Driving Systems. Amendments specify safety-belt reminder requirements for affected seating positions and modify testing procedures accordingly.