The 10K run is a long-distance road running competition over a distance of ten kilometres (6.2 miles). Also referred to as the 10K road race, 10 km, or simply 10K, it is one of the most common types of road running event, alongside the half marathon and marathon. It is usually distinguished from the 10,000 metres track running event by stating the distance in kilometres, rather than metres. As one of the shortest common road distances, many 10K races attract high levels of public participation. Among the largest 10K races, the Peachtree Road Race in Atlanta, United States had over 55,000 participants in 2011 while the Vancouver Sun Run and Bolder Boulder both had close to 50,000 runners. The popularity of 10K races lies in the fact that, for most adults, the 10K distance is long enough to represent a challenge but short enough to remain accessible for an untrained runner. Most popular 10K races are an annual fixture in a city or area and typically incorporate an element of charity running, where participants raise funds for a cause based upon their completion of the course. Members of the public may take part in the races as a competition or simply for pleasure as a fun run. Some races also allow wheelchair racers to enter. Traditional New Year’s Day races in Europe (Silvesterläuf) are often held over 10K. The accessibility of the distance, and road running in general, has meant that local governments and health charities often form partnerships with races as a way of promoting physical fitness among the general public. Medical organisations, fitness groups, drinks manufacturers and sportswear companies are typical commercial sponsors of 10K events. The 10-kilometre metric distance has been used for road running events for a large portion of the modern era of athletics – the Běchovice–Praha race is one of the longest-running events over the distance, having first been held in 1897. In Western countries using imperial measurements, the 6-mile run (9.7 km) was once more prevalent, but many long-running events (such as the Cincinnati Thanksgiving Day Race and Saltwell Road Race) have adapted their courses to match the metric distance.