The cars roll endlessly off the local assembly lines of the industry's biggest automakers, more than 10,000 a day, into the eager hands of Brazil's new middle class. The shiny new Fords, Fiats, and Chevrolets tell the tale of an economy in full bloom that now boasts the fourth largest auto market in the world.

What happens once those vehicles hit the streets, however, is shaping up as a national tragedy, experts say, with thousands of Brazilians dying every year in auto accidents that in many cases shouldn't have proven fatal.

The culprits are the cars themselves, produced with weaker welds, scant safety features and inferior materials compared to similar models manufactured for U.S. and European consumers, say experts and engineers inside the industry. Four of Brazil's five bestselling cars failed their independent crash tests.

Unsafe cars, coupled with the South American nation's often dangerous driving conditions, have resulted in a Brazilian death rate from passenger car accidents that is nearly four times that of the United States, according to an Associated Press analysis of Brazilian Health Ministry data on deaths compared to the size of each country's car fleet. In fact, the two countries are moving in opposite directions on survival rates — the U.S. recorded 40 percent fewer fatalities from car wrecks in 2010 compared with a decade before. In Brazil, the number killed rose 72 percent, according to the latest available data.

Dr. Dirceu Alves, of Abramet, a Brazilian association of doctors that specializes in treating traffic accident victims, said poorly built cars take an unnecessary toll.

"The gravity of the injuries arriving at the hospitals is just ugly," he said, "injuries that should not be occurring."

Automakers in Brazil point out that their cars meet the nation's safety laws. Some said they build even tougher cars for the country because of its poorly maintained roadways and rejected any notion that cost-cutting in production leads to fatalities.

But the country's few safety activists perceive a deadly double standard, with automakers earning more money from selling cars that offer drivers fewer safeguards — a worrisome gap for new middle-class households, whose surging spending power has outpaced consumer protections taken for granted in more developed countries. The problem extends beyond Brazil, with economic forecasts showing the majority of global growth in auto sales taking place in emerging-market nations as the world's auto fleet doubles to 1.5 billion by 2020.

"Entry-level cars in Brazil are incredibly dangerous, it can't be denied. The death rate from accidents is far too high," said Maria Ines Dolci, coordinator of the Rio de Janeiro-based consumer defense group Proteste. "The manufacturers do this because the cars are a little cheaper to make and the demands of the Brazilian consumers are less; their knowledge of safety issues is lower than in Europe or the U.S."

Manufacturers earn a 10 percent profit on Brazilian-made cars, compared with 3 percent in the U.S. and a global average of 5 percent, according to IHS Automotive, an industry consulting firm.

Only next year will laws require frontal air bags and antilock braking systems on all cars, safety features that have been standard in industrial countries for years. The country will also have new impact regulations on paper, at least; Brazilian regulators don't have their own crash-test facility to verify automakers' claims about vehicle performance, nor are there independent labs in the country.

Experts say those requirements alone are not sufficient to meet basic safety standards. Some models sold in Brazil, like the Chinese-made JAC J3, scored only one star in a recent crash test despite having air bags and antilock brakes.

An independent pilot effort known as the Latin New Car Assessment Program has run initial tests of Brazil's most popular car models, and the results are bleak.

The cheapest models of four of the five top-selling cars, made by General Motors, Volkswagen and Fiat, received a one-star rating, out of five stars, while other top sellers also scored poorly. Such a rating means cars provide little protection in serious head-on wrecks, compared to four- or five-star rated cars, which are virtually the minimum that consumers in the U.S. and Europe buy.

"The difference is you're talking about somebody dead in the vehicle or dying very quickly, or somebody being able to get out of the vehicle themselves," said David Ward, director general of the London-based FIA Foundation for auto safety, which supports the Euro and Latin NCAP programs. "It's definitely a difference between life and death."

The squat Ford Ka hatchback sold in Europe scored four stars when it was tested by Euro NCAP in 2008; its Latin American version scored one star.

Ford acknowledged that particular Ka is built on an outdated platform, and said it cannot be compared with the European version of the same name — it's that different. The company said it aims to have all its cars produced in Brazil built on updated, global platforms by 2015.

The Mexico-produced Nissan March compact sold in Latin America received a two-star rating from Latin NCAP, while the version sold for about the same price in Europe, called the Micra, scored four stars. The crash tests found the Latin American model had a weak, unstable body structure that offered occupants little protection in even non-serious wrecks.

In an emailed statement, Nissan said the March sold in Brazil is "practically the same model" offered in Europe. "The difference in the results achieved in Europe and Latin America is due to variations in the NCAP tests applied in different parts of the world."

Not so, said Alejandro Furas, technical director for the Global NCAP crash test programs.

"We perform the frontal crash test exactly in the same way as the Euro NCAP," he said. "The March and Micra were tested in the same lab, with the same type of crash test dummies, under the same conditions with the same people running the laboratory."

The Euro NCAP tests are more complete. They include side-impact and other tests, while the Latin American version only records front-impacts. Each type of impact test is individually scored on a 16-point scale.

The March sold in Brazil obtained a 7.62 rating in its frontal-impact test. The Micra fared much better, 12.7 points.

Italian automaker Fiat said in an emailed statement that "in general, Brazilian projects receive more reinforcements" within the cars' bodies to fortify them against the nation's "harsher roads and terrain."

However, NCAP tests found that Fiat's best-selling car in Brazil, called the Novo Uno, had an unstable body structure and scored it just one star.

Crash-test footage shows the front of the car folding up like an accordion, giving it a 2.0 point rating, the second lowest of the 28 cars NCAP has examined. Consumers purchased nearly 256,000 Novo Uno's last year — the second-most popular car in the country.

Renault's safety standards also vary. The French company builds its Sandero in Brazil, selling 98,400 cars last year. That car scored one star on the Latin NCAP test, but the model sold in Europe, made by Renault's Romanian subsidiary Dacia, scored three stars.

Renault said the safety record of the Sandero and its other cars were on par with autos of the same class in Brazil.

One of those is the VW Gol, Brazil's best-selling car for the last decade.

Volkswagen said it strives to maintain a global standard for body strength, putting the same number of welds on the same models regardless of where they're produced, and using high-strength steel in Brazilian cars. It added that since 1998 it's given Brazilian consumers the option of buying a car with air bags — its Gol Trend model with two frontal air bags scored three stars, while the same model without air bags scored one star.

The company didn't respond to requests for figures on how many consumers requested air bags.

"Structural integrity during a crash is a global standard for Volkswagen," the company said in an emailed statement. "The passenger compartment for the Gol remained stable and thus guarantees survival space for occupants."

Latin NCAP has tested three VW models. The Gol and the Polo had stable bodies. The Bora sedan, however, was rated as unstable, though other factors helped it score three stars.

And then there are the cars the companies do not market outside Latin America, such as the Celta by GM. Celta is Brazil's No. 5 car in terms of sales, with 137,615 sold last year. It received one star after its door unhinged and the passenger cabin roof bent into an inverted V shape during its crash test.

General Motors had no comment other than to say that its cars in Brazil are legal.

An engineer for a major U.S. automaker, speaking only on condition of anonymity for fear of losing his job, said he has watched for years as his company failed to implement more advanced safety features in Brazil, simply because the law did not require them.

""The automakers are pleased to make more profitable cars for countries where the demands, whatever they may be, are less rigorous," he said. "It happens everywhere — India, China and Russia, for example."

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