'Not standardized as the shape we know, the first of these alliterative items, black on white metal, appeared in Detroit in 1915'
a stop sign
U.S. TRANSPORTATION HISTORY: Not standardized as the shape we know, the first of these alliterative items, black on white metal, appeared in Detroit in 1915
Not standardized as the shape we know, the first of these alliterative items, black on white metal, appeared in Detroit in 1915
Not standardized as the shape we know, the first of these alliterative items, black on white metal, appeared in Detroit in 1915
U.S. TRANSPORTATION HISTORY
a stop sign
U.S. TRANSPORTATION HISTORY