Human-powered transport is the transport of person(s) and/or goods using human muscle power. Unlike animal-powered transport, human-powered transport has existed since time immemorial in the form of walking, running and swimming. Modern technology has allowed machines to enhance human-power. Although motorization has increased speed and load capacity, many forms of human-powered transport remain popular for reasons of cost, convenience, leisure, physical exercise, and environmentalism. Human-powered transport is sometimes the only type available, especially in underdeveloped or inaccessible regions. Modes Non-vehicular Crawling (human) Walking (233 watts at 3 mph) Walking bus Running (1,150 watts at 10 mph) Sprinting (1,690 watts at 15 mph) Swimming Climbing and mountaineering Ice skating, roller skating, and inline skating Cross-country skiing Human-powered vehicles (HPVs) Land vehicles Skateboards have the advantage of being so small and light that users can easily carry them when not skating. The most efficient human-powered land vehicle is the bicycle. Compared to the much more common upright bicycle, the recumbent bicycle may be faster on level ground or down hills due to better aerodynamics while having similar power transfer efficiency. Velomobiles are increasingly popular in colder and/or wetter countries due to the protection they offer against the environment. Cargo bikes are used to transport cargo. Cycle rickshaws can be used as taxicabs. In 2016, AeroVelo cyclist Todd Reichert achieved the human-powered speed record of with a velomobile at Battle Mountain, Nevada. Dutch cyclist Fred Rompelberg set a speed record at the Bonneville Salt Flats in Utah on October 3, 1995 while cycling in the wake of a motor dragster pace-car. The wake of the pace-car reduced the aerodynamic drag against which Rompelberg pedalled to almost zero. Greg Kolodziejzyk set two world records recognized by both the International Human Powered Vehicle Association and Guinness (TM) World Records on July 17, 2006 on a race track in Eureka, California. The first record is for the most distance traveled in 24 hours by human power , and the second for the world's fastest time trial (23 hours, 2 minutes). Both records were broken on August 6, 2010 by Christian von Ascheberg who drove in 19 hours, 27 minutes and managed to go in 24 hours with his Milan SL Velomobile. In the same race he also raised the 12-hour record to , which is an average of . In 1969, artists in a small Northern California town began the Kinetic sculpture race which has grown