| http://www.w3.org/ns/prov#value | - ns is responsive to the distance of the threat from the beacon, wherein the beacon is adapted to deter collision with an exposed fuel conduit, the beacon including means co-operable with the conduit to shut off fuel flow through the conduit in the event of actual or impending collision with the beacon to prevent uncontrolled leakage of fuel through collision damage to the conduit.
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