Missouri Route M (Jefferson County)
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| Route information | |
| Maintained by MoDOT | |
| Length: | 7.478 mi (12.035 km) |
| Major junctions | |
| West end: |
  Route 21 / Route MM |
 I-55
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| East end: |
  US 61 / US 67
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| Location | |
| Counties: | Jefferson |
| Highway system | |
Route M is a short arterial highway in Jefferson County, Missouri. It is a major east–west route which connects Route 21 to Interstate 55. For the majority of its length, Route M is a four lane divided highway with limited access. At its junction with Interstate 55, Route M becomes an undivided two lane road until its eastern terminus at U.S. 61/67. Route M was rerouted to its present location in the late 1990s after traffic became too great for the original road to handle. The original route is now known as Old Route M.
Route M begins as a four-lane divided highway at a diamond interchange with Route 21 near the community of Otto. West of the interchange, the highway is called Route MM. The highway heads east for less than 1⁄2 mile (0.80 km) where it has a partial cloverleaf interchange with the former alignment of Route 21, appropriately named Old Route 21. It continues east where there are two turn-offs which connect to nearby grade-separated highways. The first highway is the former alignment of Route M (Old Route M), the second is Old Lemay Ferry Road near the community of Antonia. Only the eastbound lanes have direct access to Old Lemay Ferry Road. Access is provided to the westbound lanes via median u-turn crossovers on either side of the intersection.
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Wikipedia