Here are the working papers for the sessions of the SIG on UN Regulation No. 157
- UNR157 - 16th session
- UNR157 - 15th session
- UNR157 - 14th session
- UNR157 - 13th session
- UNR157 - 12th session
- UNR157 - 11th session
- UNR157 - 10th session
- UNR157 - 9th session
- UNR157 - 8th session
- UNR157 - 7th session
- UNR157 - 6th session
- UNR157 - 5th session
- UNR157 - 4th session
- UNR157 - 3rd session
- UNR157 - 2nd session
- UNR157 - 1st session