49ers of a sort

Missouri State Missouri’s stretch of US 71 has been redesignated Interstate 49, and there’s a reason why it’s not a continuation of I-29:

The new I-49 was not called I-29 because interstate protocol requires that north-south routes increase in numerical designation from west to east.

“If it were to be named I-29, it would cross I-35 and that would be against the standard naming convention,” said Sean Matlock, transportation project manager in the Joplin office of MoDOT. “Where we are situated in Missouri, it has to be an odd number between I-35 on the west side of the state and I-55 on the east side.”

Remind me not to mention where I-40 and I-44 cross. For that matter, remind me not to mention I-99.


  1. Gil Gilliam »

    12 December 2012 · 8:35 pm

    How odd. It wouldn’t cross I-35, as 29 and 35 run together just north of the river, and 35 curves off to the west where 71 breaks south. Maybe it;s because the portion of 71 from that split down to Grandview still has stoplights?

  2. Gil Gilliam »

    12 December 2012 · 8:38 pm

    Never mind. I got it now. Going west to east you’d hit I-35 on the west side of KC and then I-29 on the east, so it’d end going I-35, I-29 and then I-55.

  3. Roger Green »

    12 December 2012 · 11:18 pm

    But I-99 is just weird!

  4. McGehee »

    13 December 2012 · 7:35 am

    Missouri State Highway 71 has been redesignated Interstate 49

    I think you mean “U.S. Highway 71.”

    One of the places my wife has looked at as a potential move-to if she can bag a promotion is Pleasant Hill, which is not far from U.S. 71/I-49.

  5. McGehee »

    13 December 2012 · 7:36 am

    …and nobody tell the naming-convention persnicketies about Atlanta, where I-75 and I-85 cross.

  6. CGHill »

    13 December 2012 · 6:51 pm

    Correction noted. (Too much revelry on the 12th to write sensibly. And I was peeved after reading that story in the KC Star.)

    Both my kids live in Jackson County, just to the north, though neither is in KC proper.

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