NEW DELHI — Several of India's most popular car models, including the famously small Tata Nano, crumpled in independent crash tests in ways that would likely lead to fatality or serious injury, a global car safety watchdog said Friday. The results are an indictment of the auto industry in India, which lacks adequate safety standards, said David Ward, head of the London car-safety watchdog Global NCAP, which performed the crash tests. India has some of the deadliest roads in the world. Drivers should be “educated and protected by regulation, but that's not happening in India,” said Ward. India's growing middle class, anxious to buy new cars, has helped fuel a booming auto industry while demanding little in terms of safety. Last year India produced 3.2 million cars, nearly twice the 1.7 million manufactured in the 2008 fiscal year. For the bulk of those sold within India, air bags and rear passenger seat belts were optional, and none was required to be tested for its ability to withstand a collision. The lack of safety features, combined with reckless driving and shoddy roads, has helped give India a road death rate that is more than six times as high as that of the US and nearly three times China's rate, according to the World Health Organization's 2013 road safety report on the number of deaths compared with the size of a country's car fleet. Seen another way, one in 10 people killed in a road accident worldwide is Indian. Four of five small cars popular on the Indian market last year — including the Tata Nano, the best-selling Maruti Suzuki Alto 800 and the Hyundai i10 — failed independent crash tests recently performed by Global NCAP. The findings were not unlike what safety assessors found in Brazil and Mexico last year. Automakers said the issue of car safety is complex, involving not just passenger safety, but also the safety of those outside the car. They said that means cars need to handle well, with good steering and brake systems while drivers must be educated about the rules of the road, and roads should be in good condition. These are all challenges in India, where roads are often unpaved and pockmarked by ditches. City streets frequently crumble under heavy traffic, monsoon rains and hot sun. The minimal fines imposed for speeding mean limits are often flouted, with drivers peeling around corners and honking at cows, bullock carts, cyclists or anything else in their way. Tim Leverton, head of Research and Development for Tata Motors, said Tata is looking again at the Nano's structure for ways to improve its strength, after already adding power steering and improving the car's dynamics. In the Indian tests, only the Volkswagon Polo's 2014 model had air bags, which were added after the earlier model failed the crash test. Volkswagon said the air bags, as well as anti-lock brakes, would become standard from Feb. 1 along with a 2.7 percent price increase to offset the costs. “We are proud to be leading the cause of driver safety,” Arvind Saxena, the managing director of Volkswagen's Indian passenger car business, said in a statement. India's biggest carmaker, Maruti Suzuki, did not respond to calls for comment. The Polo and the Ford Figo were the only two cars to maintain their structures in a 64-kph collision, while the other three crumpled at a slower speed of 56 kph in ways that would likely lead to fatality or serious injury even with air bags. — AP