@article{ref1,
title="Recognition of symbol and word traffic signs",
journal="Journal of safety research",
year="1975",
author="King, L. E.",
volume="7",
number="2",
pages="80-84",
abstract="A 35mm slide Disco projector was used to present 26 subjects with both symbol and word traffic signs, one at a time for an exposure duration of either one third-or 1/18-second.  Each presentation was followed by either a five second delay period, a 10 second delay period, or attend second interface period, the subject was required to perform a simple reading task.  10 subjects were tested at the 1/3-second viewing time and 16 at the 1/18-second viewing time.  All subjects, both drivers and nondrivers, were familiar with the word signing system, but only one had been previously exposed to the symbol system.  The results of this study show that, under these laboratory test conditions, symbol signs or more accurately recognized at the 1/18-second viewing time then are word signs.<p />",
language="en",
issn="0022-4375",
doi="",
url="http://dx.doi.org/"
}