%0 Journal Article
%T Laboratory visibility studies of directional symbols used for traffic control signals
%J Ergonomics
%D 1978
%A Smith, Graham
%A Weir, Robin
%V 21
%N 4
%P 247-252
%X <p>[Abstract unavailable]</p> <p>Language: en</p>
%G en
%I Informa - Taylor and Francis Group
%@ 0014-0139
%U http://dx.doi.org/