tour de France riders LtoR Henry Anglade ( France ), Jacques Anquetil ( France ), Raymond Poulidor ( France ) and Federico Bahamontes ( Spain ) afre pictured observing a one minute's silence in memory of the eight people who were killed on 8 July at Port-de-Couze , Dordogne , when a police van riding woth the Tour de France cyclists crashed off the road into the spectators . The ceremony was held prior to the start of the 20th stage of the race . 14 July 1964