Precast asphaltic concrete bars set in pavement surfaces to form ridges that will jolt motorist who drives over them, have been installed at several points in California, notably in San Francisco and Daly City, as protection for safety zones located beside street railway tracks.
Asphaltic pavement bars protect safety zones
Eng News-Rec
Engineering News-Record ; 131 , n 3
1943
Aufsatz (Zeitschrift)
Englisch
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