 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).In 2004, the city of San Francisco, California began experimenting with the shared lane marking, 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".