LONDON - Dutch cycling sensation Marianna Vos finally added Olympic road race gold to her impressive collection of titles after dominating Britain's Lizzie Armitstead in a two-up sprint on Saturday. Armitstead finished second at over a bike length behind to take the silver with Olga Zabelinskaya of Russia winning the bronze after 140 km of road racing. Defending Olympic champion Nicole Cooke of Britain finished with the main chasing peloton less than 30sec behind the leading trio, who came into the capital on their own to contest the medals.