Deep dive explanation of the NPRM (T. Healey/NHTSA)
The US NPRM was presented by the US since no other info was added. The subsequent discussion incl. all comments will be available from the NHTSA website soon.
Documentation
WP.29-159-GAR1
NPRM: Minimum Sound Requirements for Hybrid and Electric Vehicles (USA)
NPRM: Minimum Sound Requirements for Hybrid and Electric Vehicles
US notice of proposed rulemaking to set minimum sound levels for electric and hybrid vehicles. Supplemental document provided for convenience by GAR.