Which risk increases when a Roman road's drainage system experiences sustained blockages?

💡 Explanation

When drainage is blocked, water saturates the road base, which then freezes; expansion induces aggregate breakdown because of increased pore pressure weakening adhesion. Therefore freeze-thaw damage is more likely, rather than seismic cracking, rutting, or dust clouds, which relate to different physical forces and environmental factors.

• Which mechanism limited Roman concrete structures compared to modern formulations, despite its durability?
• Which navigational challenge limited accurate charting on 18th-century ships navigating eastward due to accumulated error?
• Which factor critically influenced the success of Roman siege towers despite advancements in defensive fortifications?
• Which structural consequence occurred when ships transitioning from carvel to clinker planking experienced ice impacts?
• Which adjustment error in an 18th-century naval sextant causes consistently inaccurate altitude readings?
• Which optical consequence arises when polishing astrolabe sighting vanes unevenly using abrasive compounds?