The fitment of electronic mirrors (eMirrors) effectively replaces an actual mirror with a tiny camera and present a large field of view with less image distortion than equivalent mirrors.
In some cases, they can even adapt the view to the driving situation (e.g. giving a wider angle when an articulated vehicle is turning so the driver can still see the rear of the trailer).
These systems can also be especially useful when integrated with blind spot information and warning systems, to focus the attention of the driver on the cab location where the potential hazard can be seen, identified and avoided.