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Insurance industry rates 8 vehicles best for collision warning and braking systems

In the highest-rated cars, the automatic brakes slowed the cars to less than five kilometres-per-hour

DETROIT—The 2014 Chevrolet Impala was the only non-luxury car to earn the highest safety rating in new tests of high-tech crash prevention systems.

The Insurance Institute for Highway Safety tested cars equipped with collision warning and automatic braking systems. It gave a “superior” rating to cars that both warned the driver of a potential collision and applied the automatic brakes to significantly slow the cars.

The BMW 5 Series, BMW X5, Mercedes-Benz E-Class, Buick Regal, Cadillac CTS, Cadillac XTS and 2015 Hyundai Genesis also earned “superior” ratings in the test results released Thursday.

Collision warning and automatic braking systems use radars, cameras and lasers to determine if a vehicle is getting too close to the car in front of it. Most of the systems warn the driver—audibly, with vibrations in the seat, or both—and prepare the brakes to maximize their effect when the driver presses them.

In some cases, the vehicles brake themselves. That action may not prevent a crash, but the institute said reducing the speed before the car hits something can help make crashes and injuries less severe.

The Impala’s rating wasn’t affected by a government investigation of one driver’s report that the automatic braking system went off several times without warning, eventually causing an accident. Insurance Institute spokesman Russ Rader said the group is aware of the investigation but had no issues with the Impala in testing.

The Arlington, Va-based institute, which is funded by insurers, began testing and rating the systems last fall in hopes of pressuring automakers to adopt them as standard equipment. The institute said 40 per cent of 2014 models now offer forward collision warning as an option, while 20 per cent offer automatic braking. Acura, Mercedes-Benz and Volvo offer the systems as standard equipment on some cars.

Tests are conducted at 12 miles per hour and 25 miles per hour. In the highest-rated cars, the brakes slowed the cars to three mph or less.

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