May 11, 1937 photo credit IDOT Chicago Traffic Photographs (University of Illinois at Chicago).
May 11, 1937 photo credit IDOT Chicago Traffic Photographs (University of Illinois at Chicago). It is an enlargement courtesy of Neil Arsenty, from the below original link with full size photo.
http://collections.carli.illinois.edu/cdm/singleitem/collection/uic_idot/id/541/rec/10
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