Car Rollovers | Rollover Safety — Consumer Reports

11 Июн 2015 | Author: | No comments yet »
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How rollovers happen and what you can do to one

A vehicle rollover is among the things that can happen to you on the Although rollovers occur in about 3 percent of all serious they account for about 30 of people killed while in a passenger vehicle.

Rollovers be so deadly. Rollover-avoidance technologies, vehicle design, enhanced systems, stronger government and increased use of safety belts cut the number killed and injured by or more. This primer explain how rollovers happen, and how the rollover tests work.

How happen. Given the right any vehicle can roll over. taller, narrower vehicles as SUVs, pickups, and vans are susceptible than traditional are because they have a center of gravity and thus are top-heavy. Sideways forces develop when a vehicle a curve shifts the center of to one side, which can have a effect on the vehicle’s balance. The forces increase with and also with rapid of direction—for example, when a makes too sharp a turn one way and overcorrects the other way. transitions can set up a pendulum effect, larger and larger swings and an loss of control.

A single-vehicle is usually not caused by a steering Instead, the vehicle usually has to on something, such as when it into a curb, pothole, or a roadside shoulder. The government has that 95 percent of rollovers from trips. Some say that number is too high. If a leans in such a way that a sidewall deforms and the wheel rim the pavement and provokes a tip-up, the government counts that as a rollover.

But Consumer Reports that very phenomenon a few during its emergency-handling tests of in the 1980s and 1990s. We consider tip-ups to be untripped, because the essentially fell over on a flat surface without some obstruction. The distinction is because the supposed rarity of rollovers has served as an excuse for the and the auto industry to play rollover risk and put the blame on the and road conditions rather on the vehicle.

Good grip, but not too much. In any tire grip plays a role in rollovers. Ideally, vehicle would stay on gripping the road with all wheels on the ground, no matter But too much tire grip can excessive sideways forces to up until the vehicle flips Before that happens, you the vehicle to gradually and predictably some lateral grip. is better than tipping but that too can put the vehicle at risk of something during the slide, and rolling anyway.

One cheap way automakers make an SUV less to rollover is to equip it with tires. That can help some rollovers but is obviously a solution since tire keeps you on the road and affects distances.

The tire-grip issue light on another potential of rollover: those sporty SUV and pickup truck tires. If replacement tires provide lateral grip than the tires, they might the chance of rollover in an emergency Our advice is to stick with that are nearly identical to that came with the The characteristics of those tires part of the basis for the vehicle’s safety potential.

Preventing and a rollover

The news is not all bad. seen in terms of rollover-fatalities per registered vehicles, all vehicle have improved, and SUVs improved the most. According to the the rollover driver-death rate newer (1 to 3 year old) vehicles dropped from 27 in the 2000 to 6 in 2012. The newest have lower rates the newest cars.

In the same the number of SUVs on the road dramatically, which is why the actual of deaths hasn’t changed despite the improved survival

Common sense and routine can greatly increase your of avoiding a rollover and walking from one if it happens. Here are survival tips:

Newer is The improvement might be because people are buckling up, or because have better build and safety systems, but it’s a result of both. Either it makes sense to choose a with the most up-to-date systems. Especially important are stability control and side-curtain air .

Wear safety belts. help keep you in the seat so you are not around in a rollover crash. half of rollover fatalities when people are partly or ejected from the vehicle. think it’s good to be clear. In all kinds of crashes, three-quarters of people ejected a vehicle are killed.

Check the Make sure all the tires are in shape and properly inflated to the recommended by the vehicle manufacturer. the inflation pressure at least a month. Replacement tires be similar to the vehicle’s original


Watch the load. Overloading any particularly SUVs and pickups, its stability. The worst practice is to heavy loads on the roof. Try to well within the load specified by the manufacturer. (They be noted in your owner’s Try to place the heaviest cargo low on the and as far from the tailgate and as close to the of the vehicle as possible.

Watch speed. Speed makes a tendencies to roll over severe, and it also makes demands on a driver’s attention and About 40 percent of fatal involve excessive speed, the reports.

Beware on country Almost three-quarters of fatal occur in rural areas on where the speed limit is 55 mph or According to the National Highway Safety Administration, those tended to be undivided highways barriers.

How the government’s rollover tests

The National Highway Traffic Administration (NHTSA) conducts dynamic rollover tests on new SUVs, pickups, and minivans. The score rollover propensity in by putting vehicles through a maneuver called a fishhook, a left-right turn, at increasing from 35 to 50 mph. This a driver overcorrecting the vehicle’s something that can happen in an

If the vehicle lifts two wheels off the it’s considered a tip-up and stops. If the vehicle slides out or through the test without at 50 mph, it passes.

Before NHTSA rated rollover with a static (non-moving) of a vehicle’s shape and weight Called the Static Stability (SSF), it’s derived a formula that compares a track width with its of gravity height. But starting 2004 models, NHTSA the dynamic (vehicle in motion) and the agency now uses those to augment its rollover ratings.

has compiled rollover ratings for of vehicles, including separate for two- and four-wheel drive of SUVs. So far, no car or minivan has up. In fact, NHTSA conducts rollover testing on only two per year and assigns star to cars based on their SSF as it did with 2003 and earlier

The scores. NHTSA combines the SSF and test to assign a rollover-resistance of one to five stars. Five represents rollover likelihood in a crash at 10 percent or less; one predicts a rollover likelihood of 40 or more. The SSFs underlying the ratings vary from 1.0 to 1.5. (The higher number, the better.) SUVs measure out at 1.0 to 1.3, and cars fall in the range of 1.3 to 1.5.

the results mean. Many have tipped up in NHTSA’s since the dynamic test is to provoke a tip-up if a steering alone can produce one. is surprising is that a tip-up affect the star rating That’s because the government’s ratings give much weight to the static measurement to the on-road test. NHTSA’s for this is that the dynamic looks for an untripped rollover which NHTSA believes are in real life.

Consumer Reports takes the that if a vehicle can tip up in a steering without impacting anything first, then that’s a reason to look for a less alternative.

NHTSA’s rollover can be found at www.safercar.gov . For specific about a vehicle’s star click on Search 5-Star Ratings, then select the class, such as SUV, its year, then the make and Scroll down to the heading and a chart there will you whether the vehicle tipped Dynamic Test Result), and its likelihood of rollover expressed as an percentage rather than a

You can also see lists of all tested within a class (passenger SUV, etc.) starting the www.safercar.gov home page, on Search 5-Star Safety then selecting just the or class and model year.

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rule strengthened but rollover still lacking

It might as a surprise, but the government doesn’t any standards that involve a vehicle over. Instead, it a public-education program that rollover propensity. But that’s not the as a performance standard, which require some level of protection when a rollover

In lieu of a rollover standard on testing a moving vehicle, the has long had a “roof-crush” rule on testing vehicles when are stationary. Roof integrity is important. A collapsing roof can or injure people no matter how they are otherwise restrained. has estimated that a collapsing kills about 600 and injures 900 people every year, though they were in.

The roof-crush regulation was finally after many years of in 2009. That was the first update in 38 years. The mandatory phase-in period starts vehicles manufactured in September, This rule change represent a significant safety but some safety advocates say the doesn’t go far enough.

Background on rollover-resistance standard. The old crush requirement was promulgated in That regulation is Federal Vehicle Safety Standard It required automakers to subject a of every model to a roof-crush before it could be sold. In test a stationary vehicle had a pressed against one edge of its The roof had to withstand a force to 1.5 times the weight of the vehicle, up to a of 5,000 pounds, without the moving more than 5

Revised roof-crush rules. The (2009) rule says vehicles weighing 6,000 or less must be able to a force equal to three their weight applied to the left and right sides of the The roof cannot bend so far it would touch the head of a test dummy.

While the passenger vehicles, those between 6,000 and 10,000 used to be exempt, they are now by the standard. However, those vehicles need only 1.5 times their own weight on the

Joan Claybrook, president of watchdog Public Citizen, the standard fails in three

It does not require the plate on the roof to be angled farther to better simulate real

It does not apply enough Experts agree that to the forces of a real rollover, should support about times the vehicle weight, not times their weight as the new specifies.

Safety belts are not to hold occupants in place a rollover. As cars roll, are pulled out of their seats and the roof. Most safety in use today won’t stop

Limits on lawsuits. Perhaps the worrisome part of the proposal is that might limit against automakers. Under the new injured occupants could not a legal claim that had any obligation to make roofs than the current standard even where state had previously held manufacturers to a standard. That means cases involving crushed could be dismissed without because the new rule, which weak standards, would them. The government, however, that concern, The Executive to the final rule sates, “We do not any potential State tort that might conflict today’s final rule. any conflict, there could not be any preemption.”

Safety advocates have argued that gently weight to a vehicle’s roof—which is how “static” rollover testing is not a proper approximation of what when a speeding car rolls especially one that rolls several times before to rest. The problem, however, has finding a test that throws a car onto its roof repeatable results.

NHTSA has that electronic stability adopted universally in model-year vehicles, will, by preventing in the first place, save lives than stronger would. That is true. we continue to believe that roofs are still a desirable

In 2009, the Insurance Institute for Safety (IIHS) introduced its own test that subjects a roof to four times the weight. Given the high of IIHS, the Institute’s test undoubtedly influence manufacturers to vehicles that meet requirements.

Toyota i-swing
Toyota i-swing

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