SABZAK PASS, Afghanistan — The hotel is perched on the side of a mountain blanketed in snow. The ice-slicked road outside is treacherous. It stretches for miles in either direction through jagged peaks as it winds around the edges of cliffs and dips past piles of boulders left over from frequent rockslides.

It’s 6:30 a.m., and inside the hotel’s kitchen, Najibullah Bastani throws kindling onto a small fire and places a dented metal teapot above its flames.

“What will this day bring?” Mr. Bastani sighed, as he watched flurries of snow graze the road outside and waited for the day’s first cars to traverse the pass.

Ever since record-breaking winter weather seized Afghanistan this year, Mr. Bastani has assumed an outsize role in this desolate stretch of highway in Badghis Province, the only land bridge open year-round that connects cities across northern Afghanistan to the west.

But the trek across the 20-mile stretch of the Sabzak Pass — which is covered in snow six months of the year — is often as dangerous as the troubles being fled. Cars slide from the road in flash storms. Rusted snow chains, held together by twine, snap off tires. Piercing wind topples over trucks, blocking the pass for days.

For these and many other distressed travelers, Mr. Bastani’s hotel has become a lighthouse of sorts.

Every trucker and taxi driver who frequents the pass knows to call him when they find a vehicle that has run out of fuel or slipped off the road. He delivers food to the passengers, calls the closest mechanic and sends a local taxi driver to bring them to the comfort of the hotel.

His efforts illustrate that in times of crisis — civil war or foreign invasion or government collapse or an economic crisis like that gripping Afghans today — the kindness of strangers often holds the country together, an informal social backstop.

“It’s my duty if I know them or even if I don’t know them,” said Mr. Bastani, 52. “I have to help them.”

The small guesthouse, known as the Sayed Abad Hotel, sits on a small gravel strip at the center of the pass. Behind it is a small village, whose mud-brick dwellings are home to about 80 families. Next to the hotel are a few shops selling dust-coated cans of energy drinks, an outhouse with a rickety wooden door, and a shed of kindling that village children collect each morning.

Mr. Bastani let out a wry laugh and handed him a glass of tea. Soon some other men lumbered down from the village into the warmth of the kitchen and rested on a bench across from the fire.

“We can’t stay home, our children will destroy us — they make so much noise all the time,” said one of the men, Jalil Ahmad.

As the temperatures plummeted earlier in the year, congregating in the kitchen each morning had become their daily routine — looking for warmth as much as company.

The camaraderie was a welcome change for Mr. Bastani. When he arrived in the area a year ago and asked to lease the hotel, the men in the village were skeptical of the stranger. But Mr. Nabi, the hotel’s original owner, was also eager for help running the business.

For much of the past 20 years, the pass had been maintained by about 1,200 Afghan soldiers, tasked by the Western-backed government with protecting the vital route from the Taliban.

The soldiers oversaw the highway’s transformation from a dirt path to a paved road and assisted those who ran into trouble trying to traverse its unforgiving terrain. But when the Western-backed government collapsed, so too did the safety net those soldiers provided. Practically overnight, the hotel became the round-the-clock headquarters for roadside assistance.

“The government was solving people’s issues in the past,” Mr. Nabi said, adding that the Taliban administration has stationed far fewer of their soldiers along the pass.

After he took over running the hotel from Mr. Nabi, Mr. Bastani assumed the role of the so-called Keeper of the Pass, a guardian for everyone who dares cross it. Mr. Bastani said he relished the role, so different from what his life had been.

He spent his late teenage years fighting for an Afghan warlord who encouraged his troops to kill and steal at will, then deserted his comrades in search of work in Iran, where he became addicted to drugs. His new life, helping others along the road each day, seemed to offer him a sort of redemption.

His eagerness to serve has injected new energy into the surrounding village that — much like the pass — had languished since the Western-backed government fell and the economy tanked with it.

“It didn’t used to be like this,” said one shopkeeper, Abdul Khaliq, 40. “It used to be when you went to relatives for help, they gave you money, gave you food. But if you go to a relative now and ask for help, they will say, ‘if I give you something now, then tomorrow what will I eat?’”

The struggle to provide for one another has been felt across the country, shaking the fabric of Afghan society as profoundly as the changes the new government has wrought.

But for the thousands of travelers braving the unforgiving pass each week, there is Mr. Bastani and his warm kitchen and his cellphone always at the ready and the men around him offering to lend a hand.

“How many are you there? Want tea?” Mr. Bastani called through a window into the main room.

When the driver asked about the conditions of the road, Mr. Bastani recounted the story of a fatal accident only days earlier, after a bus without chains on its tires had slid off the road into a small ditch.

All of its passengers disembarked except for an older woman and young boy who stayed on board, not wanting to wait in knee-deep snow. But before Mr. Bastani and his men could move the bus back onto the road, it suddenly slid farther and tumbled off a cliff — killing both the woman and the boy.

“You need to put on chains,” one of the shopkeepers advised the driver sternly.

“And if you don’t put chains on,” Mr. Bastani added, “God only knows.”

Before the driver departed into the white landscape, he shook Mr. Bastani’s hand. He hoped not to see these men again, he confided, but was comforted knowing that, if he needed them, they would be there.