Missouri supplemental route

A supplemental route is a state secondary road in the U.S. state of Missouri, designated with letters. Supplemental routes were various roads within the state which the Missouri Department of Transportation was given in 1952 to maintain in addition to the regular routes, though lettered routes had been in use from at least 1932. The goal of the secondary highway system was to place state-maintained roads within 2 miles (3 km) of more than 95% of all farm houses, schools, churches, cemeteries and stores. The four types of roads designated as Routes are:

  • Farm to market roads
  • Roads to state parks
  • Former alignments of U.S. or state highways
  • Short routes connecting state highways from other states to routes in Missouri
  • Supplemental routes make up 19,064 miles (30,681 km) (59%) of the state highway system.

    Highway designations

    The more major supplemental routes of the system are ones assigned with single-letter designations (such as "K"). Minor branch routes and farm-to-market roads, which often end at county roads or are former alignments of the other highways, are typically assigned with two-letter designations consisting of two of the same letter (e.g. "KK"). Additionally, combinations of letters may be used, but always with A as the first letter (such as "AD"); the only exception of this is on Route BA in western St. Louis County. Combinations beginning with the letter R are also used for routes that connect with state parks or other recreational facilities, which is the only use of R on the system; Route AR, a non-recreational route south of Bakersfield, is the only exception to this.

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    Road construction and maintenance projects

    Lima Ohio 27 Apr 2025
    State Route 66 between the city of Delphos and the village of ... State Route 81 between the Van Wert County line and State Route 66 (0-3 MM) will be restricted to alternating one way for pavement repair.
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    Overturned semi closes I-70 near Ohio 4 in Clark County

    Springfield News-Sun 25 Apr 2025
    Interstate 70 is closed after a semi truck overturned near Ohio 4 in Clark County. It’s not clear if any injuries have been reported ... CLARK COUNTY. I-70 CLOSED in BOTH DIRECTIONS 0.3 miles beyond I-70/SR-4 Split (MM ... Use alternate route ... 1 ... ....
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    TRAFFIC ALERT: Route MM CLOSED in McDonald Co. for Pipe Replacement April 16 (MoDOT - Missouri Department of Transportation)

    Public Technologies 15 Apr 2025
    McDonald County Route MM between Noigo Road and Hilltop Road west of Noel ... All lanes of Route MM CLOSED where crews are working Drivers will have access to driveways and entrances on either end of the ...
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    4 dead in car-bus collision in Karnataka

    The Times of India 11 Apr 2025
    NEW DELHI ... The two girls, both engineering students, hailed from Mysuru.The group was en route to MM Hills to attend the Shivarathri Jathra Mahotsava when the accident occurred around 9 am ... .
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