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There are four new signal heads in this photo. The worker I talked to said that one is for left-turning drivers, one is for northbound bicyclists, one is for northbound drivers, and one is for southbound bicyclists.
Chicago Department of Transportation Bureau of Electrical Operations workers were out in force on Saturday and Sunday installing new traffic signal poles and signals. The Dearborn Street cycle track project, a two-way bike lane on the left side of the one-way road, includes bicycle signal heads pointing north and south. Also new are signal heads for northbound Dearborn Street traffic that will turn left across the cycle track.
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CDOT is using 12-inches diameter bicycle lenses, the same size as non-bicycle lenses. Amsterdam and Copenhagen use much smaller bicycle signal heads. Continue reading Construction update: CDOT readies Dearborn Street cycle track with bicycle signals