Missouri

[Great Lakes Roads]

I imagine I-70 will come, the problem is it's all under construction. A six lane I-70 will likely be posted at 75 mph in the next 5 years.

And I-57.

[elsmere241]

Roadways confirmed to go to 75:
https://www.firstalert4.com/2026/10/21/these-4-interstates-will-see-speed-increase-certain-areas-beginning-this-fall/?fbclid=IwdGRjcAVGBORleHRuA2FlbQIxMQBwZG9mBWZkaWQWUQsMpu1JWbJ6hxWRORYICAtpTwFzZHNydGMGYXBwX2lkCjY2Mjg1NjgzNzkAAR5Y7yH16SHHbg1d_YMEjL0mmuVtNHVKZeA5PVkY9wGlYlqQsiJ9230Z0vgw4Q_aem_t62Jda1ycHbejmim4WPYWA



FAR fewer than I thought they'd do, but it's better than nothing I suppose.

Iowa and Florida next plz?

Is "I-47" real?  I've never heard of it.

[kphoger]

Is "I-47" real?  I've never heard of it.

↓  ↓

They should've made the Interstate shields wider for the state's 3dis.

[elsmere241]

Is "I-47" real?  I've never heard of it.

↓  ↓

They should've made the Interstate shields wider for the state's 3dis.

I see now.

[ModernDayWarrior]

Not surprised either that none of 44 was included--it has a ton of truck traffic, and it's curvy and hilly east of Springfield. It's eventually going to need six lanes once the I-70 project is done.

The only part of this I find bizarre is that 49 gets a bump south of Nevada but not to the north. There's very little difference in those two stretches of Interstate. 57 and 155 in the southeast could certainly handle 75 too, but they're also fairly short so MoDOT may have decided they're not worth the trouble.

[kphoger]

The only part of this I find bizarre is that 49 gets a bump south of Nevada but not to the north. There's very little difference in those two stretches of Interstate.

Yeah, I thought that was strange too.  I've only driven it once, but I certainly don't remember a huge change at Nevada.

[ElishaGOtis]

Official 75 announcement. https://www.modot.org/node/98692

[Revive 755]

Official 75 announcement. https://www.modot.org/node/98692

They couldn't even take the 75 mph sections of I-29 and I-35 to the Iowa border?  I don't recall any big issues in the last/first 2.5 miles on I-29 after crossing in from Iowa.

[roadman65]

So I-44 failed the test.

[Scott5114]

The only part of this I find bizarre is that 49 gets a bump south of Nevada but not to the north.

That's because north of Nevada is Oregon, which is famously resistant to speed limit increases.

...Wait, what thread is this? Oh, well, that's very different. Never mind.

[TheHighwayMan3561]

Official 75 announcement. https://www.modot.org/node/98692

They couldn't even take the 75 mph sections of I-29 and I-35 to the Iowa border?  I don't recall any big issues in the last/first 2.5 miles on I-29 after crossing in from Iowa.

It's not all that uncommon for states with a higher max limit to have a small buffer zone when a route is approaching the border for a state wirh a lower limit.`

[kphoger]

It's not all that uncommon for states with a higher max limit to have a small buffer zone when a route is approaching the border for a state wirh a lower limit.`

Interesting.  I can't think of any examples I'm personally familiar with, other than where there's another apparent reason for the drop.

[Revive 755]

That's because north of Nevada is Oregon, which is famously resistant to speed limit increases.

...Wait, what thread is this? Oh, well, that's very different. Never mind.

The stretch of I-29 by Oregon MO is going to 75 

Which is actually one of the spots that 70 might have been justified - a couple of hills around that area (example) are going to need climbing lanes if traffic increases.

EDIT:

It's not all that uncommon for states with a higher max limit to have a small buffer zone when a route is approaching the border for a state wirh a lower limit.`

Interesting.  I can't think of any examples I'm personally familiar with, other than where there's another apparent reason for the drop.

I can't think of any buffer zones either (though now I wonder why there seems to be so many towns with a reduced speed limit near state lines).  A difference of 5 mph doesn't seem enough to warrant a buffer zone - especially when a lot of traffic is already going 75 or more in Iowa.  If there's not another legitimate reason to reduce the speed limit just put a reduced speed ahead sign in prior to the border.