Found some minor issues for the route that need to be addressed.
1) Found a missing interchange @ Greenfield Road. It's between the 'MI39' & 'I-94(210A)' points.
2) EcoRd, WilRunAir, & WiaRd need to be re-centered, as US-12 shrunk in that area from a dual-carriageway to just use the 'former' EB alignment. Also the 'WilRunAir' point will need to be marked as 'closed'.
3) Would add a point @ Brooklyn Highway (just to the West of 'MI50'). Reason is because of the big NASCAR track there of Michigan International Speedway.
The 'MI50' point could also use a recenter too.