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British Rail track maintenance staff currently use a portable warning device to provide audible warning of approaching trains. The audible signal comprises a train warning signal, which is continuous and the same signal broken into a series of discrete 'bleeps' to signify that it is safe to work. If the audible signal ceases entirely when bleeping then men… (More)
Ten audible warning signals, selected by the Police Scientific Development branch as alternatives to the current signal, were evaluated in the laboratory in comparison with the conventional signal as to their 'attention getting' effect. Forty-two subjects were required to detect signals of rising intensity against a background of in-car noise whilst also… (More)