Which risk increased during Roman road construction across marshland using the 'agger' method?

💡 Explanation

When Roman roads were constructed across marshland utilizing the ‘agger’ method, soil consolidation occurs due to the weight of the built up embankment, possibly leading to uneven settling and compaction of the substrate. Therefore land subsidence becomes more likely, rather than affecting taxation; disease spread, or raid susceptibility which are unrelated to the method's mechanics.

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