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| M-40 |
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| Length: | 74.22 mi[1] (119.45 km) | ||||||||
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| Formed: | ~1920 | ||||||||
| South end: |  US-12 in Porter Twp. |
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| Major junctions: |
 M-60 in Newberg Twp. M-216 in Marcellus I-94 near Paw Paw M-43 near Gobles Concurrency M-89 in Allegan Concurrency ends in Valley Twp. I-196 in Holland |
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| North end: |  US-31 in Holland |
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| Counties: | Cass, Van Buren, Allegan | ||||||||
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>M-40 is a north-south state highway in southwestern lower Michigan. The northern terminus is at US 31 to the south of Holland and the southern terminus on US 12 (the old US 112) near Mottville. It does not quite reach the Indiana state line. Originally, M-40's southern terminus was Niles; in 1971, M-40 was realigned southward, replacing what had been M-119; the former M-40 not concurrent with Interstate 94 was renumbered M-51.[1] Heading southeastward from Holland, M-40 has an interchange with I-196, it passes through the unincorporated town of Hamilton, then merges with M-89 about six miles northwest of Allegan. In Allegan, it turns south and separates from M-89, passing through Gobles, crossing the Kal-Haven Trail, and forms a junction four miles south with M-43. The junction is known locally as Armstrong Corners. At Paw Paw it intersects with I-94. Following that it passes through Lawton, Marcellus and then intersects with M-216. It goes through Jones at the junction with M-60. Its terminus is at US 12. All of M-40 is an undivided surface route. Between Holland and Allegan it is heavily traveled (M-89 leads to Battle Creek and a junction with US 131, which connects with Kalamazoo).
