The City of Detroit DPW with Giffels-Webster has embarked on assessing truck routes, specifically within Southwest Detroit where truck traffic is heaviest due to transportation hubs and the current international bridge.
Find other study updates from DPW here:
https://detroitmi.gov/departments/department-public-works/sw-trucks-en-route-pilot-study
DETROITography 
Wow, I am glad to see the Detroit truck route area. I think this the heaviest transportation hubs.