Definition:Collision liability
⚓ Collision liability — also known as the running-down clause (RDC) — is a component of marine hull insurance that covers the shipowner's legal liability when the insured vessel collides with another ship and causes damage to that other vessel, its cargo, or associated interests. While the term might suggest a connection to automobile collision coverage, collision liability in insurance parlance is firmly rooted in ocean marine practice and operates under principles quite distinct from those governing auto insurance.
🔧 Under a standard hull and machinery policy, the collision liability clause indemnifies the insured shipowner for sums the owner becomes legally obligated to pay the other vessel's interests as a result of a collision at sea. Coverage customarily extends to three-fourths or four-fourths of the liability, depending on the policy form. The remaining quarter, if not covered under the hull policy, is typically picked up by the shipowner's protection and indemnity (P&I) club. Importantly, the clause generally covers only ship-to-ship collisions; damage to fixed or floating objects such as docks, buoys, or offshore platforms falls outside its scope and is instead addressed by P&I coverage or separate liability arrangements.
🌊 For marine underwriters and shipowners alike, collision liability provisions represent a critical intersection of hull and liability coverage. Disputes over fault allocation in maritime collisions can involve complex admiralty law proceedings across multiple jurisdictions, and the financial exposure from a major collision — including damage to cargo, pollution cleanup, and wreck removal — can dwarf the value of the vessels involved. Underwriters must carefully coordinate the collision liability clause with P&I and excess liability placements to avoid both gaps and overlaps, making this one of the more technically demanding areas of marine underwriting.
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