As the crow flies:
1. I-43 (69 miles)
2. I-96 (74 miles)
3. I-75 (84 miles)
Driving distance:
1. I-96 (87 miles)
2. I-75 (106 miles)
3. I-296 (unsigned, 115 miles)
4. I-196 (118 miles)
In driving distance, the following interstates are all closer than I-43 (whose closest point via driving distance is 348 miles): I-39, I-41, I-55, I-57, I-65, I-69, I-70, I-74, I-80, I-88, I-90, I-94, I-180 (IL), I-190 (IL), I-194 (MI), I-275 (MI), I-290 (IL), I-294 (IL), I-355 (IL), I-375 (MI), I-465 (IN), I-469 (IN), I-475 (MI), I-475 (OH), I-496 (MI), I-675 (MI), I-696 (MI), I-865 (IN)