联合国欧洲经济委员会（联合国/欧洲经委会）第81号法规-关于批准带或不带侧车的两轮机动车辆后视镜在把手上安装的统一规定

Regulation No 81 of the Economic Commission for Europe of the United Nations (UN/ECE) — Uniform provisions concerning the approval of rear-view mirrors of two-wheeled power-driven vehicles with or without side-car, with regard to the mounting of rear-view mirrors on handlebars