TOKYO (AFP) - Tokyo shifted its bid to host the Summer 2016 Olympics into higher gear Sunday by temporarily closing the city's landmark highway bridge to let 5,000 people march to promote the Japanese capital. The seven-kilometre (four-mile) walk over the Rainbow Bridge featured Japanese athletes who are helping to promote Tokyo's bid to host the global event for the second time. Tokyo, Chicago, Madrid and Rio de Janeiro have presented their 2016 bids to the International Olympic Committee. The host city will be chosen by the IOC on October 2 in Copenhagen. Tokyo wants to host the "most compact and sustainable Games in history" with 95 percent of all 34 venues located less than eight kilometres from an 80,000-seat main stadium to be built on a landfill site. Some 70 percent of the venues, 23 of which already exist, are within 10 minutes of the athletes' village.