Which risk increases when Roman road builders compacted soil in layers with insufficient drainage during construction?

💡 Explanation

When soil lacks proper drainage, water accumulates and subject to freeze-thaw weathering leading to expansion cycles causing road surface cracking, due to water volume increase upon freezing. Therefore cracking occurs, rather than sinkholes, asphalt melting or sediment buildup that involve distinct mechanisms influenced by different environment factors. Those would need groundwater erosion, high temperatures or river dynamics.

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