Excerpt:
2,000 people were stranded recently when a chunk of Highway 1 fell into the sea near Big Sur. The solution may lurk in an unlikely place: Yorkshire

The first time Gary Griggs drove the Pacific Coast Highway, it was the early 1960s. He was a college student heading north to San Francisco for the weekend with his girlfriend in an elderly Volkswagen van, occasionally getting out to give it a push.

“At that point not that many people drove the highway,” Griggs, who is now an expert on coastal erosion, said. Near the southern end, where the highway begins its run up the edge of a furious ocean, atop cliffs and beneath steep mountains, “people coming down that had just made it would wave to you, [as if to say:] ‘Good luck!’” he said.

Since then generations of engineers have strengthened it with buttresses, bridges and tunnels, and it has become one of the most famous roads in the world. Yet driving it can still be a dicey proposition and there are now questions over whether the highway can survive at all.

Last Saturday, after days of heavy rain, a chunk of the road in Big Sur vanished down a cliff side into the sea, and up to 2,000 people were stranded. Since then the California department of transportation has been leading twice-daily convoys of motorists who wish to make their way south, heading along a single lane past the place where a large bite of tarmac is missing.

There is one convoy at 8am and one at 4pm, said Nicholas Pasculli, a spokesman for Monterey County. Over the weekend the county opened a shelter in a conference centre in Big Sur, where stranded people could stay. About 450 people stayed in camp grounds, he said. “And of course a lot of people camped out in their cars overnight.”

Convoys to get people in and out began on Sunday and will continue, “weather permitting”, he said. “Right now the weather is great,” he said. But later in the week, particularly on Friday, it looks like rain.

Daniel Swain, a climate scientist at the University of California, Los Angeles, said it was only the latest and not the largest piece of the highway to go missing in recent years. “It’s just that it occurred at a pinch point,” he said. “Would you want to drive the other lane that hasn’t yet slipped into the ocean? It’s correctly viewed as a risky proposition.”

A relatively small population lives along the road, and some are multimillionaires. But there are also, he said, “folks who are not wealthy who live in the canyons that come off the highway”. And “for some of these places there isn’t alternative access by road. There have been periods in the last decade where people have had to hike out.”

It offers a more dramatic and picturesque vision of the knotty choices that will face millions more in big coastal cities. “It’s a major state highway that runs along huge cliffs over the water,” he said — they are under constant assault by the ocean.

“Those cliffs are often the first thing the waves hit after travelling from the south Pacific ocean thousands of miles away,” he said. On the other side of the road, “the Big Sur mountains rise directly out of the ocean thousands of feet into the air”, lifting the rivers of cloud sweeping in off the Pacific and prompting rain. The road would be in a delicate situation “even if there was no climate change”, he said. “That’s how geography works.”

Even as climate change is causing heavier rain and rising sea levels, Swain does not like the idea of abandoning the road. “It’s not really clear what we should do about it,” he said…