Which geological outcome frequently resulted along ancient Roman road alignments passing through clay-rich soil regions?

💡 Explanation

When Roman roads traversed clay-rich soils, concentrated water infiltration occurred through roadbeds and drainage which saturated and destabilized the soil via pore pressure increase, increasing landslide activity because of reduced shear strength. Therefore, landslide activity increased, rather than sediment reduction, pH elevation, or salinity decrease which involve different geological or hydrological responses.

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