Shulou(Shulou.com)11/24 Report--

CTOnews.com, Sept. 22 (Xinhua) according to a new study by the American Automobile Association (AAA), automatic emergency braking (AEB) is quite good at preventing low-speed rear-end collisions, but performs poorly when the vehicle is driving at a more normal speed.

Starting in September 2022, all new cars sold in the United States must be equipped with a standard AEB system, which uses front-facing cameras and other sensors to brake automatically in the event of an impending collision. The American Highway Safety Insurance Association estimates that AEB may help prevent 28000 car crashes and 12000 injuries by 2025.

The AAA wants to test the AEB with four common vehicles to see how it has developed since it was first loaded on production cars nearly 20 years ago, but the results show that it is not very good.

"the automatic emergency braking system has done a good job of handling the limited tasks of its design," Greg Brannon, director of automotive engineering and industry relations at the American Automobile Association, said in a statement. "Unfortunately, this task was set many years ago, and regulators' slow collision standards have not been developed."

The team tested four cars with driving aids, including the AEB: the 2022 Chevrolet Equinox LT, the 2022 Ford Explorer XLT, the 2022 Honda CR-V Touring and the 2022 Toyota RAV4 LE.

Over the years, AEB has proved useful in reducing low-speed rear-end collisions, but AAA wants to test how it performs in two more common and deadly crashes: a T-type collision and a left turn in an oncoming vehicle. From 2016 to 2020, these two types of car accidents accounted for nearly 40% of all deaths involving two passenger cars.

The results were quite frustrating. In the left turn test in front of the Model T and oncoming vehicles, the AEB failed to prevent accidents 100%, and the system failed to warn drivers and slow down.

CTOnews.com learned that AEB performed slightly better in rear-end crash tests, but only if the speed was low. At 30 mph, the system prevented 17 of 20 collisions, or a success rate of 85%. In the collision test, the impact speed also decreased by 86%. But at 40mph, AEB prevented only six of the 20 rear-end collisions, with a success rate of only 30 per cent. For the test run where the collision occurred, the impact speed was reduced by 62%.

This is not the first time the AAA has pointed out the shortcomings of automatic brakes and other driving aids. A 2019 study by the group found that AEB performed poorly in preventing cars from crushing dummy pedestrians at 20mph.

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