http://99percentinvisible.org/articl...nflicted-grid/

The above link is an informative article that explains the four major influences on road alignments within Detroit. There's also an interesting historic documentary that is embedded within the article [[that some of you have probably already seen).

...Many of the traffic problems found in Detroit exist at places where different approaches [[like the grid and shoreline systems) intersect, creating strange junctures or forcing elaborate turns. To minimize complications, subsequent additions have been made to conform wherever possible — even more recent freeways of the mid-1900s mainly ended up following systems laid out long in advance, paralleling spoke streets, shoreline or cardinal grids...
1965 Wayne State documentary on Detroit's road grids [[also embedded within the article): https://archive.org/details/detroitspatternofgrowth