GM Cleared to Use Camera-Based Rearview Mirror

A new video camera-based interior rearview mirror from General Motors Co. meets federal requirements as long as it can switch between modes that allow it to act like a conventional mirror, according to the National Highway Traffic Safety Administration.

GM asked NHTSA to clarify the rules for rearview mirrors before launching its new Full Display Mirror system this spring on the all-new Cadillac CT6 sedan. GM describes the feature as the first application of a streaming high-definition rear-view video camera. The technology will be expanded to other GM models later.

In a letter responding to GM’s request, NHTSA says the added capabilities of the Full Display Mirror don’t “alter its basic identity as an item that includes an inside rearview mirror of unit magnification.” Based on previous demonstrations and conversations with GM, the agency says it understands the GM system to be a dual-mode unit that allows users to switch between a reflective mirror and camera images.

The agency also says it assumes that vehicles equipped with the new technology will include conventional exterior side mirrors. Several carmakers have recently shown concept cars that use video cameras in place of side mirrors, which still are required on all passenger vehicles in the U.S.

GM’s new system features a mirror/display developed by Zeeland, Mich.-based Gentex Corp. The companies say the video feed improves a driver’s field of vision by as much as 300% and eliminates visual obstructions caused by the host vehicle and rear-seat passengers.

Japan’s Sharp Corp. produces the camera and developed the video processing technology with GM, which has 10 patents related to the technology. The carmaker says the high-definition system helps reduce glare and provides a crisper image in low-light situations.