All rear-view mirrors must be adjustable in direction.
The reflecting surface must be contained within the mirror housing, and the radius of curvature at any point along the periphery of the housing (in any direction) must be greater than or equal to 2.5 mm. If the reflecting surface protrudes beyond the housing, the radius of curvature of the edge of the protruding part must be no less than 2.5 mm; furthermore, the protruding part must be capable of retracting into the housing when subjected to a force of 50 N. This force shall be applied horizontally and parallel to the longitudinal median plane of the vehicle at the point of maximum protrusion of the reflecting surface beyond the housing.
For the edges of mounting holes or recesses on mirror components that have a diameter or maximum diagonal dimension of less than 12 mm, the radius of curvature requirement specified in 2.1.2 need not be met if the edges have been rounded.
Following mirror testing, accessible parts of the interior rear-view mirror shall be contacted with a spherical model having a diameter of 165 mm, and accessible parts of the exterior rear-view mirror shall be contacted with a spherical model having a diameter of 100 mm. For all parts within these accessible areas-including those connecting to the support (regardless of the adjustment position)-the radius of curvature must be no less than 2.5 mm.
The mounting component connecting the rear-view mirror to the vehicle shall be designed such that a cylinder with a radius of 50 mm-centered on the axis of rotation or the pivot point that allows the mirror to deflect in the direction of impact-intersects the surface to which the mounting component is attached.