【題組】55. Which of the following is TRUE with regard to the development of traffic signage systems?
(A) The basic patterns of most traffic signs were set in Paris at the 1908 International Road Congress.
(B) By 1900, the Congress of the International League of Touring Organizations in Italy proposed thestandardization of road signage.
(C) In 1909, nine European governments and the United States agreed on the use of four pictorial symbolsindicating "bump," "curve," "intersection" and "railroad crossing."
(D) Some of the European road signs have been included in North American traffic signage system since the1960s.