Which risk increases when Roman road construction deviated from standard compact layering of aggregate base?

💡 Explanation

When layered compaction is skipped, load distribution weakens because poorly interlocked aggregates cause differential settlement and shear stress concentration, exceeding material's inherent friction limits. Therefore, reduced load distribution creates instability, rather than frost heave, erosion, or thermal cracking which are normally countered with properly engineered drainage and layering.

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