Today, the road trip is along what would be known as the Michigan Road Auto Trail, and major parts of the original Michigan Road, from Madison to Logansport, through Versailles, Greensburg, Shelbyville and Indianapolis. After Logansport, this road connected to Michigan City in a much straighter path than the original Michigan Road did.
The major difference between the Auto Trail and the Historic Michigan Roads is the section between Bryantsburg and Napoleon. The road connects these two points directly. The Auto Trail veered to the northeast, first traveling through Versailles before heading northwest to Napoleon. SR 29 would follow this latter path. Before the Great Renumbering, the road south of Indianapolis was designated SR 6. North of Indianapolis, it was SR 15.