Burly truckers share thermoses of sweet coffee, cook rice and beans on camp stoves and lounge in the shade of Amazon jungle palms, waiting for their rigs to be towed through a half-mile stretch of waist-deep mud.

Help can take hours or even days to arrive on BR163, one of Brazil's worst national highways. But there's good money to be made in hauling everything from jungle hardwood to Coca-Cola in these parts, and there are rumblings that the highway is about to get a lot better.

One thing is on the lips of everyone from the truckers to the new settlers of roadside towns that appear on few maps: asphalt, and the growth and opportunity it will bring to a big swath of the world's largest wilderness.

In a controversial plan, Brazil's government is preparing to let private companies embark on a $417 million paving project to turn BR163 into a modern, two-lane, toll highway stretching 1,100 miles, nearly the distance between Philadelphia and Miami. The proposed road would link Brazil's most important soy-growing region with a deep-water Amazon River port.

Truck traffic will skyrocket as the country opens up a new export corridor for soybeans, Brazil's most important crop. Trips that now take weeks during the half-year rainy season will be cut to hours.

The pavement is bound to boost migration, prompting warnings from environmentalists of an ecological disaster driven by deforestation. But no one is trying to stop the paving of BR163; supporters and critics agree that the economic forces driving the project are unstoppable.

No longer will truckers have to snooze in hammocks beside dense forests of poisonous snakes and spiders, grunting monkeys and capybaras, 140-pound rodents that roam the road at night. Instead, they'll rest at truck stops serving all-you-can-eat Brazilian barbecue already popping up in hamlets now separated by quagmires.

"I've been waiting for the pavement for 20 years," said Honorato Gomes da Silva, a Brazilian trucker. "We're used to sleeping in the forest, but that will be a thing of the past when the pavement comes."

This jungle highway isn't the Trans-Amazon Highway, another mostly muddy road running east-west from the Atlantic Ocean to Colombia, which was scheduled to be entirely paved decades ago.

About half of the north-south BR163 is paved, but not the half that agribusiness needs, in the jungle. Work on that segment could begin as early as this year and take three years.

Once it's completed, Brazil, which has become an agricultural superpower over the last decade, would be able to drastically reduce the price of sending its crops abroad.

"The Trans-Amazon is last-century stuff," said Riordan Roett, director of Western Hemisphere studies at Johns Hopkins University's School of Advanced International Studies in Washington. "The north-south route is where you get the soybeans, and it is a logical route for inland migration as well," from Brazil's populous south to the relatively uninhabited Amazon.

Environmentalists and Indian tribal leaders warn that the pavement will eliminate even more rain forest and pollute the region with crime, drugs and prostitution.

Unless growth is under strict federal control, they say, the road could also bring violent land conflicts. In Para, the Brazilian state where most of the paving will take place, those conflicts are often solved by gunslinging pistoleiros.

Critics point to the February killing of Dorothy Stang, an American nun who spent 23 years protecting the rain forest and peasants. The killing was blamed on a rancher who coveted land Stang was trying to protect. The government responded with an environmental crackdown, freezing development in 32,000 square miles along BR163. But environmentalists believe the ban will be lifted within a year.

"Economics are determining the fate of the Amazon," said Paulo Adario, who heads Greenpeace's Amazon project. "The paving is inevitable, and at the end of the day, the discussion is centering on what we are willing to lose."

That's a bet made by waves of ranchers, loggers, storekeepers and farmers who have washed into the land around the road, a region the size of France, Germany and Italy combined. Keen on exploiting natural resources that will be more accessible by road, many spent their life savings to resettle in towns that only recently got electricity and phone lines.

Novo Progresso, a town straddling BR163, has doubled its population to 40,000 in only five years. Its merchants sell everything from chain saws to veterinary supplies and sometimes compare the paving project to the Transcontinental Railway, which opened up the American West to immigration and development in the 19th century.

Supporters say the highway will bring jobs to help ease poverty throughout Brazil, many of whose 184 million residents consider themselves lucky to make the minimum wage of $125 a month.

"I'm not against preservation, but we have to find ways to solve Brazil's social problems. And the way to do this is through development, progress and jobs," said Mayor Tony Rodrigues, a newcomer who teamed up with Chinese partners to start one of dozens of new sawmills in Novo Progresso.

After years of delay, Brazil's Congress passed a law in December that opened the paving of BR163 to private funding.

Behind the momentum is agribusiness, which accounts for about 40 percent of gross domestic product and provides tens of millions of jobs.

Soybeans are king, with Latin America's largest country second only to the United States in production. Brazil is desperate for a cheaper and faster route to export the commodity because of supply bottlenecks caused by crumbling highways and overburdened Atlantic ports.

BR163 cuts 600 miles off the trip, providing a direct link from Brazil's top soybean-growing state of Mato Grosso to the Amazon River, where Minneapolis-based Cargill Inc., Brazil's largest soybean exporter, built a $20 million port three years ago, anticipating the paving of the road.

Trucking a metric ton of soybeans from Mato Grosso to the Atlantic ports costs about $82 during harvest time, but would cost only $50 to $60 via BR163, said Seneri Paludo, a grains analyst at AgRural, a Brazilian consulting firm.

Up to 10 million tons could eventually move on the highway annually, translating into shipping savings of up to $320 million a year that would be passed on to customers in Europe and China.

"BR163 needs to happen," Paludo said. "It would really improve our competitiveness with the North Americans, and has turned into a question of economic viability."

But Indians living near the road say loggers are already illegally cutting some of the trees they use to make their traditional canoes, and they worry that the road will bring farmers who will cut down more trees to make way for cattle, soy and other crops.

"The forest gives us our life," said Francinaldo Rocha, a leader of about 150 Munduruku Indians who fish, hunt and grow cassava and corn along a tributary of the Amazon River. "The asphalt is really just for the rich."

The road also would benefit multinational companies like Honda Motor Co. and Royal Philips Electronics NV, which set up shop decades ago in the remote free-trade-zone city of Manaus.

Instead of using boats to ship computers, cell phones and televisions to southern Brazil, the companies could take advantage of BR163 and cut days and thousands of miles off the trip.

Honda, for example, sends 1 million motorcycles to southern Brazil every year, at a per-bike cost of $42 that could be reduced to $29 via BR163. That saves $12.5 million, said Issao Mizoguchi, Honda's plant manager in Manaus.

In a bid to ensure orderly growth, Brazil's government is completing a development plan to control a land rush that could boost the area's population from nearly 2 million people to as many as 3.5 million by 2020. The draft plan calls for increased federal presence to stem illegal logging and land seizures, and social programs to help poor families and prevent landowners from turning workers into debt slaves.

Critics warn that the government has no track record to prove it can handle the potentially overwhelming task. Brazil has some of the strictest environmental legislation in the world, but the laws are often poorly enforced.

"Is the government ready to put a soldier behind each tree?" Adario asked. "This is the question."

Cowboys herd cattle on the BR163 highway near the Amazon town of Novo Progresso, whose population has doubled to 40,000 in five years. People try to free a pick-up stuck in a muddy stretch of the BR163 highway near the Amazon town of Novo Progresso.