Shared lane marking

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.

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).

[5] 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.

[10] Behavioral studies prepared for the Federal Highway Administration and the city of San Francisco have shown that streets with shared lane arrows increase separation between motor vehicles and cyclists, encourage cyclists to ride outside of the door zone, and may reduce wrong way cycling and sidewalk cycling, which are associated with increased crash risk.

[13] A 2016 study commissioned by the Transportation Research Board conducted a comprehensive longitudinal analysis of census block groups in Chicago.

[18] The city of Seattle, Washington included extensive use of shared lane markings in its Bicycle Master Plan of early 2007.

In the Czech Republic, a series of sharrows on shared lanes are called Cyklopiktokoridor which translates as "cycle pictogram corridors".

[24] In Germany, the concept is not yet established officially, but some local authorities use simple bike logos for the same purpose, without having a specific term for them.