Having a bit of own-car in the side mirror allows for verification that the mirror is oriented as intended. Is there an orientation test for the SAE recommendation?
Yes, while driving, use cars in the lanes beside you. As a car passes you can adjust your side mirror so it catches the car just as it leaves your rear view mirror. With this setting, the passing car will enter your peripheral vision before it leaves your side mirror.
Once set you can find a head position that allows you see your own car, and you can use that position to reset your mirrors after the wife drives your car.
