 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.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.