This was because the portion of I-696 between I-75 and M-10 opened in December 1989, while I-275 was completed in 1977.
EDIT: 48307, when you have time, you can download JOSM [[a program intended to be an external Openstreetmap editor), download areas along the alignments proposed in the book from the OSM server onto the program, recreate what the book shows, not upload the results onto the OSM server and post screenshots.
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