For the vast majority of mass-produced vehicles, the exterior side mirrors are not symmetrical; this is a functional design choice based on driving safety, not a design oversight.
While many people assume that the left and right exterior mirrors are symmetrical, in reality, they are not. To ensure the driver has a consistent field of view on both sides-thereby facilitating better observation of traffic conditions behind the vehicle-the mirror on the driver's side is typically designed with a larger surface area and lower curvature, while the mirror on the opposite side has a smaller surface area and higher curvature. Consequently, in left-hand drive (LHD) vehicles, the left mirror is often relatively larger, whereas in right-hand drive (RHD) vehicles, the right mirror is relatively larger. Furthermore, the mounting positions of the left and right mirrors often differ slightly.
Asymmetry in size and curvature: In LHD vehicles (the standard in China), the driver sits on the left, placing them closer to the left mirror and farther from the right mirror. Designers make the left mirror larger with lower curvature and the right mirror smaller with higher curvature; this asymmetrical design compensates for the difference in distance, ensuring the driver's field of view remains as consistent as possible on both sides. In RHD vehicles, the configuration is reversed, with the right mirror made larger.
Asymmetry in tilt angle: Due to the driver's perspective, the right mirror is angled more sharply toward the vehicle body than the left mirror (typically tilted inward by about 12.4 degrees). This design increases the effective reflective area of the right mirror, thereby effectively reducing the driver's blind spot on the right side.