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Tesla Model S, BMW i3 fall short in IIHS electric car crash tests [videos]

Two all-electric vehicles fall short of meeting the Institute’s awards criteria, but consumers who want to minimize gas consumption while also prioritizing safety can choose from two plug-in hybrids that earn the 2017 TOP SAFETY PICK+ award.

The two recently evaluated 2017 all-electric models are the Tesla Model S and the BMW i3. The plug-in hybrid models are the Chevrolet Volt, whose award was announced in December, and the Toyota Prius Prime.

“There’s no reason the most efficient vehicles can’t also be among the safest,” says David Zuby, IIHS executive vice president and chief research officer. “We hope Tesla and BMW will continue to refine the designs of their electric models to maximize driver protection and, especially in the case of Tesla, improve their headlights.”

To qualify for TOP SAFETY PICK, a vehicle must earn good ratings in all five crashworthiness evaluations — small overlap front, moderate overlap front, side, roof strength and head restraints — and have an available front crash prevention system that earns an advanced or superior rating. The “plus” is awarded to vehicles that meet all those criteria and also come with good or acceptable headlights.

The Model S, a large luxury sedan, earns good ratings in all IIHS crashworthiness evaluations except the challenging small overlap front crash test, in which it earns an acceptable rating. Despite lengthening the side curtain airbags to improve small overlap protection in the Model S, Tesla ran into problems in the test when the safety belt allowed the dummy’s torso to move too far forward. That allowed the dummy’s head to hit the steering wheel hard through the airbag. Measurements from the dummy indicated that injuries to the head, along with the lower right leg, would be possible in a real-world crash of the same severity.

The ratings for the Model S apply to 2016 and 2017 cars built after October 2016. Tesla says it made a production change on Jan. 23 to address the head-contact problem, and IIHS will test the updated vehicle for small overlap protection as soon as it can be delivered.

Although the i3, the Volt and the Prius all did better in the small overlap evaluation than the Model S, the results can’t be compared because the Model S is larger than the others. Since the kinetic energy involved in a front crash depends on the speed and weight of the vehicle, the Tesla’s acceptable rating is based on a more severe crash than the good ratings of the lighter cars.

One version of the Model S, the P100D, also falls short on roof strength, which is important for protecting people in a rollover crash. The rating is based on a strength-to-weight ratio. The P100D has the same roof structure as other Model S versions but is heavier, due to a larger battery, so it earns an acceptable rating.

The current version of the Model S hasn’t yet been rated for front crash prevention. While automatic braking equipment comes standard, Tesla hasn’t yet activated the software for all vehicles.

The 2017 Model S isn’t available with anything other than poor-rated headlights. Tesla says it is working with its supplier to improve the headlights, and IIHS will evaluate the new ones when they are available.

The i3, a small car, fails to reach the winner’s circle because it rates only acceptable in the head restraint and seat evaluation, which measures a vehicle’s ability to protect against neck injuries in a rear crash. While such injuries are rarely fatal, they are the most common type of crash injury and can cause debilitating pain.

BMW i3 earns good ratings in the other crashworthiness tests and is available with an optional front crash prevention system that earns an advanced rating. The system reduced the impact speed by an average of 9 mph in the 12 mph track test and by 7 mph in the 25 mph test. Its warning component meets National Highway Traffic Safety Administration criteria.

The i3’s only available headlight system earns an acceptable rating.

The 2017 Volt can be optionally equipped with either an advanced- or superior-rated front crash prevention system. It earns a good rating for headlights when equipped with optional high-beam assist, which automatically switches between high beams and low beams based on the presence of other vehicles. Without high-beam assist, the Volt’s headlights are acceptable.

The Prius Prime is the plug-in version of the Prius hybrid, also a TOP SAFETY PICK+ winner. Its standard front crash prevention system earns a superior rating, and its only available headlights earn an acceptable rating.

IIHS plans to test another green car, the all-electric Chevrolet Bolt, once it becomes widely available later this year.

Feb 1, 2017Blagojce Krivevski
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Blagojce Krivevski

Blagojce Krivevski is physicist and green technology lover. Keep in touch with Blagojce through his email, web site, Twitter, Linkedin, Facebook and Google+.

February 1, 2017 Electric Car News2017 volt, bmw i3, Chevrolet Volt, IIHS, IIHS Top Safety Pick, model s, Prius Prime, tesla model s, Top Safety Pick +, Toyota Prius Prime
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