Results of studies made concerning relative effectiveness of following types of protection: warning signs, visible and audible signals, gates or barriers, and grade separations. Before 22nd Annual Safety Congress.
Railway crossings need positive protection
Nat Safety News
National Safety News ; 28 , n 6
1933
3 pages
Aufsatz (Zeitschrift)
Englisch
© Metadata Copyright Elsevier B. V. All rights reserved.
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