This Regulation applies: (a) To compulsory and optional devices for indirect vision, set out in the table under paragraph 15.2.1.1.1. of this Regulation for vehicles of category M and N and to compulsory and optional devices for indirect vision mentioned in paragraphs 15.2.1.1.3. and 15.2.1.1.4. of this Regulation for vehicles of category L1with bodywork at least partly enclosing the driver. (b) To the installation of devices for indirect visions on vehicles of categories M and N and on vehicles of category L1 with bodywork at least partly enclosing the driver.