Route Description
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 miles (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.
Route M continues east, where it has two at-grade intersections before entering Barnhart; one at St. Luke's Church Road and the other at Moss Hollow Road. At Barnhart, the intersection with Marriott Parkway connects Interstate 55 traffic with gas stations and retail stores. As of December 2009, the I-55 interchange was being reconstructed to better handle access to southbound I-55. East of the I-55 interchange, Route M becomes a two-lane highway and ends a mile (1.6 km) later at a T intersection with U.S. Route 61 / U.S. Route 67.
Route M, along with Route 21, make up the Jefferson County Scenic Byway.
Read more about this topic: Missouri Route M (Jefferson County)
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