Re: Standards needed
I suggest you look at how fast such things were fixed in New Zealand after both the Christchurch and Kaikoura earthquakes. Kaikoura was initially completely cut off, no communications, no power, water and sewage cut, thousands of tourists in town. The tourists were taken off in a RNZN tender ship. Their campervans and hire cars were stockpiled until road connections were re-established to a decent degree.
The telcos worked hard, helicoptering in tech teams and got cell coverage fixed within 48hours.
Kaikoura sits at the head of river valley half way along the Kaikoura coast which is Maritime Alps which rise directly out of the sea with a deep underwater subduction canyon right off shore where sperm whales dive for giant and colossal squid.
The main road and only rail line run along that coast, cut into the mountainsides with the sea on the other side. They swap which one is seaward and which landward at various points via rail tunnels.
There is one other road, up the river valley and over, a minor road. It also suffered damage including bridges destroyed. For some time it was the only route, in daylight hours only in guided convoys.
On State Highway 1, the main N-S route the mountains fell on it, the quake uplifted, broke and shifted it. In places the rails were shifted across the road and left suspended over the uplifted seaward rocks.
It reopens in a fragile, still, being worked on, only during daylight hours just before Xmas. An enormous effort requiring advanced geotechnical techniques has been required. Many thousands of helicopter hours, sluicing land slips, ferrying workers and materials. Dozens of people are employed purely to move on NZ fur seals getting in the way of the works. It is currently their breeding season, bulls have set up territories along the coast.
Beautiful, isolated and very, very rugged.
NZ is not a rich nation, it is only just first world and not everywhere. The money was found, the works planned and started, usually started before all the plans are in, they are still planning. In places the road will be rebuilt with more room on the uplifted seaward rocks.
At least they won't have to worry so much about sea level rise affecting the route. By the time sea level reaches the new level another uplift quake will have moved it up again. 2-4m uplift in most places, up to 9m in others. The quake was apparently very loud, the land complained as it was treated as though it was plastic and as the mountains fell down.