Abstract
Abstract The paper deals with types of human errors which are associated with the structural characteristics of signals and the meanings they convey. It begins with a theoretical analysis of signalling systems in general, resulting in the differentiation of various types of error and the formulation of some guidelines for reducing the sources of errors. The method of analysis is then applied primarily to a study of recall errors in railway signalling, including a comparison of two coding procedures and summaries of experimental findings.
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