Which risk increases when a Roman road's drainage ditches become blocked with debris?

💡 Explanation

When drainage ditches are blocked, water infiltrates the road structure because capillary action is unimpeded, causing the road base to saturate, which then induces freeze-thaw damage during temperature variations, initiating potholes. Therefore, pothole formation, rather than other mechanisms occurs as it requires freeze-thaw cycles enabled by blocked drainage.

• Which outcome occurred when Roman legionaries used the 'vinea' siege weapon against fortified walls?
• Which limitation restricted practical surveying using early medieval astrolabes, due to inherent trigonometric functions?
• Which construction challenge did Roman builders face when constructing fortifications on unstable clay soils?
• Which mechanical effect limited the size of late 19th-century steam turbine blades before the advent of improved metallurgy?
• Which mapping transformation causes distortions when projecting the celestial sphere using an astrolabe's stereographic projection?
• Which mechanism primarily minimized roadbed settling under Imperial Roman roads with multiple layers?