Metrication in the United States traditional mile-based lengths. In the Olympics, athletes run 1500 meters, not 1600 meters. Running races in the U.S. are usually run in metric distances (e.g., the 100 metres dash or the 5K run), although the mile distance remains popular. But even 5 and 10 kilometer races most often have mile markers on the course, and no kilometer markers. Long-distance races are often measured in kilometers, although exceptions exist (generally 10 mile races). The marathon is referred to as a 26.219-mile race (the official marathon standard distance originally being in English units — 26 miles, 385 yards) rather than 42.195 km.
2012 Olympic Marathon Course distances relative to the lap start point of various prominent landmarks passed on the route are shown in the table below: When London submitted its bid for the Olympic Games in 2004, the bid chairman Sebastian Coe said: "The marathon course has been designed to include as many of the city's landmarks as possible". Although the final route is different from the one proposed in the bid, it still passes many notable landmarks. Originally the route was planned to start at Tower Bridge, run through Tower Hamlets and finish at the Olympic Stadium. It would have had a 580 m