smart car crash

smart car crash

Smart Car Crash

ARLINGTON, Va. — The Smart car is getting a lot of attention for its small size and style, and now it’s earning impressive crash test ratings. In recent Insurance Institute for Highway Safety tests, the 2008 Smart Fortwo, the smallest car for sale in the U.S. market, earned the top rating of good for front and side crash protection. Its seat/head restraints earned the second-highest rating of acceptable for protection against whiplash in rear impacts. Smart Fortwo is classified a microcar, meaning it’s smaller even than minicars. Weighing about 1,800 pounds, the Smart is more than 3 feet shorter and almost 700 pounds lighter than a Mini Cooper. It weighs about a third as much as one of the heaviest vehicles the Institute has tested, the BMW X5, a midsize SUV. As the price of fuel climbs and tougher federal fuel economy requirements kick in, auto companies are expected to introduce more small vehicles to the market. The Smart is the smallest car the Institute ever has tested. Front evaluation Side evaluation Rear crash protection Electronic stability control Good Good Acceptable Standard Smart Fortwo frontal crash test Smart Fortwo side impact crash test “The big question from consumers is, ‘How safe is it?'” says Institute president Adrian Lund. “All things being equal in safety, bigger and heavier is always better. But among the smallest cars, the engineers of the Smart did their homework and designed a high level of safety into a very small package.” The Institute’s test results generally demonstrate how well vehicles stack up against others of similar size and weight. Frontal ratings can’t be compared across weight classes, meaning a small car that earns a good rating isn’t safer than a large car that’s rated less than good. “People base their buying decisions on a lot of factors,” Lund says. “If you drive only in congested urban areas where speeds are low, a small car may be more practical than a big one. We conduct crash tests so people who want small cars can choose the ones that afford the best protection.” The Smart has a crashworthy design for its size and is equipped with the latest safety gear, which is especially important in a small car. This vehicle’s standard equipment includes seat-mounted combination side airbags designed to protect both the heads and chests of the driver and passenger. Also standard is electronic stability control (ESC), called electronic stability program in the Smart. ESC helps drivers maintain control during emergency maneuvers or on slippery roads. It engages automatically when it senses vehicle instability, and Institute research has found that ESC lowers the risk of fatal single-vehicle crashes by about half. Restraints do more of the work in frontal crashes The Smart mostly lacks a front-end crush zone, which is a key component in reducing injury risk in serious frontal crashes. Typically, front-end structures are designed to crush and absorb crash energy, allowing occupant compartments to slow more gradually, ideally with little or no intrusion into drivers’ survival space. Then a vehicle’s safety belts and airbags slow occupants further and are designed to spread crash forces more evenly across people’s bodies. The longer the front-end crush structure of a vehicle, the more gently occupants are slowed and thus protected from injury. To compensate for the lack of front-end crush space, the Smart’s restraint system does more of the work of absorbing energy as occupants “ride down” a crash. “We recorded a high head acceleration when the driver dummy’s head hit the steering wheel through the frontal airbag,” Lund explains. This indicates the test dummy used up all of the available ride down room in the Smart’s interior. A stiff side structure and standard side airbags contributed to the Smart’s good rating in the side test, which replicates a crash with a pickup truck or SUV. Injury forces recorded on the driver dummy’s head, neck, torso, pelvis, and left leg all were low. However, the driver door unlatched during the crash. This confirms a finding of the National Highway Traffic Safety Administration’s side test of a Smart released last month. The Institute downgraded the Smart’s structural rating from good to acceptable, but the opening didn’t appear to affect dummy movement during the test, and injury measures on the driver dummy were low. Still, doors shouldn’t unlatch because in some crashes it could allow partial or complete occupant ejection, especially if an occupant is unbelted. Small car safety While small cars are safer now than before, so are large cars. In every category of passenger vehicle (car, SUV, or pickup truck), the risk of death is higher in crashes of smaller, lighter models. For vehicles 1-3 years old during 2006, minicars experienced 106 driver deaths per million registered vehicles compared with 69 driver deaths in large cars. People often choose very light cars for fuel economy, but “you don’t have to buy the smallest, lightest car to get one that’s easy on fuel consumption,” Lund points out. “The Toyota Prius, for example, earns good front and side crash test ratings. It gets better fuel economy than a microcar, but it’s bigger and weighs more so we would expect it would be more protective in serious crashes.” How the Smart was evaluated The Institute’s frontal crashworthiness evaluation is based on results of a 40 mph frontal offset crash test. A vehicle’s overall evaluation is based on measurements of intrusion into the occupant compartment, injury measures recorded on a Hybrid III dummy in the driver seat, and analysis of slow-motion film to assess how well the restraint system controlled dummy movement during the test. The side evaluation is based on performance in a crash test in which the side of a vehicle is struck by a barrier moving at 31 mph. The barrier represents the front end of a pickup or SUV. Ratings reflect injury measures recorded on an instrumented SID-IIs dummy in the driver seat, assessment of head protection countermeasures, and the vehicle’s structural performance during the impact. Rear crash protection is rated according to a two-step procedure. Starting points are measurements of head restraint geometry — the height of a restraint and its horizontal distance behind the back of the head of an average-size man. Seats with good or acceptable restraint geometry are tested dynamically using a dummy that measures forces on the neck. This test simulates a collision in which a stationary vehicle is struck in the rear at 20 mph. Seats without good or acceptable geometry are rated poor overall because they can’t be positioned to protect many people.
smart car crash 1

Smart Car Crash

by Lauren Steele On Thursday, Tesla announced the first fatal car crash to involve an autonomous car in the United States.Former Navy SEAL and technology entrepreneur Joshua Brown was driving in Florida with his Tesla Model S in Autopilot mode when it hit a tractor-trailer after the system failed to detect the tractor-trailer turning in front of the car. Brown often shared YouTube videos of his drives taken while his Tesla engaged in autonomous Autopilot mode. Just last month, he posted a video that captured a similar situation that nearly resulted in a crash when a truck tried to cut him off on an exit ramp, but the Autopilot feature allowed the Tesla to swerve and avoid any collision. After that incident, Brown had praised Tesla for the impressive, and well-functioning, technology.The fatal crash has opened a formal investigation by the National Highway Traffic Safety Administration, and details are beginning to come to light. The AP reports that “by the time firefighters arrived, the Tesla wreckage — with its roof sheared off — had come to rest in a yard hundreds of feet from the crash site.” For the car to hit a tractor-trailer and continue its momentum for hundreds of feet indicates a high rate of speed, even after the initial collision. This is due to Autopilot continuing to accelerate after the crash happened.However, the conditions of the situation were very unusual. “Neither Autopilot nor the driver noticed the white side of the tractor trailer against a brightly lit sky, so the brake was not applied,” Tesla said in a statement on its corporate site. “The high ride height of the trailer combined with its positioning across the road and the extremely rare circumstances of the impact caused the Model S to pass under the trailer, with the bottom of the trailer impacting the windshield of the Model S.”Despite the scary circumstances of Brown’s crash, autonomous technology has proved to be a safe and smart way to travel since the release of Autopilot last October. In that time, vehicles using Autopilot have traveled more than 130 million miles, according to Tesla's data logs, with this being the first, and only, fatal crash.Smart cars, combined with attentive drivers, are the safest mode of transportation on the road, according to Bryant Walker Smith, a professor at the University of South Carolina School of Law. While people like to think of an autonomous car as a tool for multitasking, it's really a tool for safety, and it’s important for drivers to stay alert to experience the full benefits of the technology. Topics: Cars Want More? Sign up for our newsletter to get the latest adventures, workouts, destinations, and more. Please enable javascript to sign up for the newsletter. We may use your e-mail address to send you the newsletter and offers that may interest you, on behalf of Men’s Journal and its partners. For more information please read our Privacy Policy How we use your email address

Smart Car Crash

Smart Car Crash
Smart Car Crash
Smart Car Crash
Smart Car Crash
Smart Car Crash

Published on Jul 15, 2017 | Under Car | By michael ellis
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