Disadvantages of Clapper Bridges: Fragile, Dangerous, Inaccessible

Clapper bridges—ancient stone-slab spans on stone piers—are picturesque but impractical for modern use. Their drawbacks:

• Difficult construction: Requires large flat stones, precise fitting, skilled labor; no mortar.
• Low load capacity: Slabs crack under heavy/vehicular loads; vulnerable to flood debris impact.
• Slippery, uneven surface: Algae, moss, ice make crossing hazardous; no handrails.
• Not accessible: Stepped or gapped slabs exclude wheelchairs, walkers, and those with mobility impairments.
• Maintenance-intensive: Scour undermines piers; slabs shift; no redundancy—single slab failure collapses span.

They survive as heritage footbridges (e.g., Dartmoor, Exmoor) but are obsolete for transport. Modern equivalents use reinforced concrete or steel with non-slip decks, railings, and engineered foundations.