As late as 1981, there was a one-block gap in the route of Martin Luther King Boulevard [[which it had just been renamed from Myrtle Street in January 1981) where it intersected Grand River, resulting in confusing turns to pick the road back up.

By the late 1990's, the widened MLK Boulevard had been extended through [[path in red in the included 1981 aerial photo) and then widened from Grand River west to West Grand Boulevard. The I-96 overpass had already been built to accommodate a widened Myrtle/MLK back when the freeway opened in 1970.

It is likely possible that the Myrtle street signs west of Grand River weren't replaced with MLK ones until after the widening, though I can't fully confirm that.

When exactly was MLK extended across Grand River and widened west of there?