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Massive viaducts are going up and can be seen driving up and down State Route 99.

Nearly half a million tourists visited the viaduct in the first 10 months of 2023, according to National Trust Scotland.

National Highways said two of the four northbound lanes remained closed on the viaduct, between junctions 20 and 21, and warned drivers to allow extra time.

Network Rail, which owns the site, said that meant the 183-year-old viaduct was no longer "as it was" and was in need of protection.

Since the fire, Caltrans said, it has implemented new oversight measures and imposed stricter requirements for prospective tenants of so-called airspace properties, often located under freeway viaducts.