ECE R41.04 Supplement 02 Noise emissions of motorcycles
amended the table
final
https://www.unece.org/fileadmin/DAM/trans/main/wp29/wp29regs/2015/R041r2am2e.pdf
draft
https://www.unece.org/fileadmin/DAM/trans/doc/2015/wp29/ECE-TRANS-WP29-2015-002e.pdf