When cars were first invented, they had no mirrors at all. As the Driving.ca website notes, it was not until the 1930s that rearview mirrors came as standard features in all vehicles, and ten years later, the driver’s side mirror came into normal use. The passenger’s side mirror came later, and even now, it is a recommendation rather than a requirement in Canada. However, all vehicles come with a passenger’s side mirror as part of its standard equipment.