An injury accident can occur as a result of the convergence of the four factors ie. unsafe action, unsafe condition, personal factors and proximate casual factor. The proximate factor is the immediate causative factor, ( eg.failure brake) which by its reaction causes sudden closing together or convergence of the four factor to cause an injury accident.The four factor are complementary to each other .If any one is withdrawn, during or just before convergence an injury accident is averted.
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