I-69 westbound west of US127 was poorly constructed about 20 years ago. First time I was on that section with my old 5th wheel I thought something was wrong with my rig. I avoid that section when possible and use US127 around the east side of Lansing.
I-69 south of Lansing is falling apart. A major reason for this is the heavy truck traffic. Michigan allows the highest gross vehicle weights (GVW) in the Midwest. Most states allow an 80,000 pound GVW while Michigan allows 160,000. This is the result of the auto industry's need for steel and is a left-over allowance for the industry since the 60s. Trucking companies will try to tell you that additional axels/wheels spreads out the heavy weight, but that is BS. Other states in the frost/freeze states do not allow such heavy weights and their roads last longer. Michigan's falls apart quicker than their roads.