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A shared-lane marking or sharrow〔(23rd Streetscape Project ), City of Richmond website, access date December 28, 2008〕 is a street marking installed at locations in Australia, Canada, United States or Spain. This marking is placed in the travel lane to indicate where people should preferably cycle. According to the US Manual on Uniform Traffic Control Devices, shared-lane markings are used to: * Assist cyclists with lateral positioning in a shared lane with on-street parallel parking in order to reduce the chance of a bicyclist impacting the open door of a parked vehicle; * Assist cyclists with lateral positioning in lanes that are too narrow for a motor vehicle and a bicycle to travel side by side within the same traffic lane; * Alert motorists of the lateral location bicyclists are likely to occupy within the traveled way; * Encourage safe passing of bicyclists by motorists; and * Reduce the incidence of wrong-way bicycling.〔Manual on Uniform Traffic Control Devices, Part 9, Traffic Control for Bicycle Facilities, 2009, ()〕 ==History== These markings are used in the USA, Australia and other countries. In US usage, the wide shape of the arrow, combined with the bike symbol, gave rise to unofficial names such as "bike in a house" or "sharrow". In the UK roughly the same function is served by a bicycle symbol without arrows. However, this tends to be used more as an indication of a formal cycle route rather than as an encouragement to share the road. The original "bike in a house" or "man jumping barrels at home" marking was developed by James Mackay and included in the 1993 Denver Bicycle Master Plan.〔(1993 Denver, Colorado Bicycle Plan )〕 While Mackay had considered a "connect the dots" pavement markings approach for bicycle route definition and cyclist lane positioning reinforcement (during his time as the Bicycle Facilities Engineer for the North Carolina Department of Transportation), the City of Denver's unwillingness to commit to bike lane markings meant that shared lane markings were the only pavement marking treatment for bicyclists that the City would implement. The hollow arrow surrounding the cyclist was intended to reinforce the correct direction of travel for bicyclists (who were frequently observed riding the wrong way, against traffic, in Denver).〔e-mail from James Mackay to John S. Allen, May 21, 2011〕 In 2004, the city of San Francisco, California began experimenting with the shared lane marking,〔(【引用サイトリンク】title=San Francisco's Shared Lane Pavement Markings: Improving Bicycle Safety", February 2004 )〕 and developed a revised symbol consisting of a bicycle symbol with two chevron markings above the bicycle. In the process, the name ''sharrow'' was coined by Oliver Gajda, of the City and County of San Francisco Bicycle Program, and is a portmanteau of ''share'' and ''arrow''.〔(San Francisco Bay Bikers blog entry on San Francisco Chronicle site )〕 In a 2009 paper,〔 (Alternate URL )〕 Northeastern University researcher Peter G. Furth proposed the "Bicycle Priority Lane", which combines sharrows with dotted lines inside the usual lane markings. This marks a five-foot-wide zone in the center of the lane which bicyclists are encouraged to use. The city of Boston, Massachusetts began experimenting with these markings in 2013. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「shared lane marking」の詳細全文を読む スポンサード リンク
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