challenged by teammate Hill and by Ayrton Senna. Shortly before the Portuguese Grand Prix in October 1993, Prost announced he would not defend his world title, because the clause in his contract did not extend to 1994 and Senna would be able to join Williams for the upcoming season, and instead opted to retire. At the season's end Prost held the record for most Grand Prix victories, a record that stood for almost a decade. On the podium in Adelaide in 1993, Prost's last race, he and Senna embraced. Prost was surprised by the gesture, as Senna had declined a handshake at the previous race. Prost's performances earned him an OBE. German Michael Schumacher broke Prost's record of 51 Grand Prix wins during the 2001 season. He also shares the record for starting every race of a season from the front row (16, in ), with Ayrton Senna () and Damon Hill (). , he is the last Frenchman to have won his home Grand Prix. Helmet Prost used a helmet design based on the three colours of the French flag, blue, white and red, with his name along the side. During his early career Prost used a basic design of white all over with some blue detail around the visor (blue helmet with a white 180° flipped Y and red lines in the lower branch of the flipped Y and in the upper branch, surrounding the top). During Prost's time at Renault, he used more blue details, most notably around the rear of his helmet. Prost's helmet changed in 1985, as his helmet now had the blue detail around the front, surrounding the visor (with also a blue stripe on the side region, making the white area become a P) and a white ring with red lines surrounding the top (forming a white circle with a blue half in the rear of the top). Prost kept a similar design for his entry at Ferrari and Williams. Sometimes Prost used variants of his helmet design. In 2007 he used his original design, but with the circle top all red and a red line in the lower chin area. In 2010, he used a pearl white helmet with silver flames and a blue-white-red-white-blue stripe on the visor, designed by Kaos Design. Career legacy Prost is widely regarded as one of the greatest ever Formula One drivers, and is considered by some