Automatic emergency-braking systems that are promoted as a safety feature in vehicles don’t always work as intended and at times activate when there is no risk of a crash, drivers say.
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Technology cuts down on crashes but can also activate when there is no risk; ‘I was so scared’
By Ben Foldy
Aug. 27, 2019 5:30 am ET
Automatic emergency-braking systems that are promoted as a safety feature in vehicles don’t always work as intended and at times activate when there is no risk of a crash, drivers say.
Drivers have reported several hundred incidents to U.S. regulators in recent years of these brakes malfunctioning or not deploying properly, highlighting the challenges car makers face in introducing new technologies that automate more of a car’s driving functions.
The automatic braking features use cameras, sensors and radar to detect objects and can hit the brakes if the driver doesn’t act fast enough. Safety advocates say the technology has significantly reduced accidents and can save lives, and auto makers view such crash-avoidance systems as a critical part of developing autonomous cars.
But the National Highway Traffic Safety Administration has fielded more than 400 individual complaints in the last three years from drivers of vehicles made by Nissan Motor Co. , Volkswagen AG , Honda Motor Co. and other major car manufacturers flagging auto-braking problems, according to a Wall Street Journal analysis of the agency’s public database.
Most are from drivers saying they have had trouble with the automatic brakes deploying suddenly when there is no evidence of danger—at highway speeds, in some cases. Some drivers also reported braking systems failing to engage as expected in the presence of a threat.
Some automatic braking systems activate for pedestrians, while others engage only for other cars. Some try to avoid a collision entirely, while others aim only to slow the car and reduce the impact of a crash.
Auto makers say automatic braking mishaps are often the result of “false positives”—the vehicle’s computer getting confused by a nonthreatening object like an overhead sign or a shadow and triggering the brakes.