Officially known as “shared lane markings”, there are at least six unique designs for the marking on Chicago streets. The current standard, as set forth by the Manual of Uniform Traffic Control Devices (MUTCD), looks like this:
A sharrow design installed by CDOT’s contractors on Milwaukee Avenue across from Uprise skate shop as part of a refreshing of the sharrows in the 1st Ward. You can see the dimension of the design it replaced. The current sharrow has a “pointer” and narrower chevron; the chevron tips are aligned differently, too. Installed in 2012.
A second sharrow design, installed after water main construction on Milwaukee Avenue near Metzger Court and the Tocco restaurant. Notice how parts of it are tearing off. Installed in 2011.
A third sharrow design on Milwaukee Avenue across from the Aldi at Leavitt Street. Installed 2005.
A fourth sharrow design, on Clark Street just north of the Chicago River. Installed 2012.
A fifth sharrow design (“bike in house”) on Halsted Street just south of the Chicago River. Installed in 2003 or prior.
Then there’s the inverted sharrow, the sixth design. This location, at Elston Avenue and Webster Avenue, was installed after 2005 when the bike lane here was shortened to accommodate a left-turn lane. This is an older design but when Lincoln Avenue’s sharrows were refreshed in 2011, the design was repeated instead of switching to the current and proper design standard.