Which problem increased on Roman roads during the empire's expansion impacting transport efficiency?

💡 Explanation

As the Roman empire expanded, the volume of traffic on roads increased, and the increased axle loads caused cumulative surface deformation and rutting because of material yield under repeated stress. Therefore rutting increased, rather than salting, lower tolls, or labor shortages, which concern other issues.

• Which benefit occurred due to terrace construction combined with sophisticated irrigation in Inca maize cultivation?
• Which structural vulnerability existed when Roman fortifications relied primarily on limestone-based mortar exposed to high temperatures?
• In ancient Mesopotamian irrigation systems using bronze components, which electrochemical process accelerates corrosion in brackish water?
• Which mechanism enabled Ibn al-Haytham's (Alhazen) accurate descriptions of image formation via pinhole?
• Which risk increased when ancient Mesopotamian irrigation canals breached a levee due to seasonal flooding?
• Which instability risk increased in Roman ballistae when using lower-density projectile stones during sieges?