The brothers recognised the value of publicity that participation in motor racing could generate for their vehicles. Renault made itself known through succeeding in the first city-to-city races held in Switzerland, producing rapid sales growth. Both Louis and Marcel raced company vehicles, but Marcel was killed in an accident during the 1903 Paris-Madrid race. Although Louis never raced again, his company remained very involved, including Ferenc Szisz winning the first Grand Prix motor racing event in a Renault AK 90CV in 1906.