Freeways that end at roundabouts

[silverback1065]

I-587.

how is this allowed to be an interstate?

Why shouldn't it be?


iPhone

Better question: Why is Wyoming I-180 an Interstate?

another good question that no one has given me a good answer to.

But my question is why wouldn't they be? In I-180's case, that's obvious: Interstate aren't supposed to have intersections. But what's the reason with I-587? What characteristics does it have that Interstates aren't "supposed to" have?

What you just said, it has an at grade intersection, a roundabout

[NE2]

How is a roundabout any more at-grade than, say, a RIRO?

[cl94]

How is a roundabout any more at-grade than, say, a RIRO?

Even if we consider a roundabout to be at grade, there's a direct ramp from I-587 to I-87, so that puts it as being no worse than I-790 (actually, better because it directly connects at the terminus).

[empirestate]

I-587.

how is this allowed to be an interstate?

Why shouldn't it be?


iPhone

Better question: Why is Wyoming I-180 an Interstate?

another good question that no one has given me a good answer to.

But my question is why wouldn't they be? In I-180's case, that's obvious: Interstate aren't supposed to have intersections. But what's the reason with I-587? What characteristics does it have that Interstates aren't "supposed to" have?

What you just said, it has an at grade intersection, a roundabout

That's at the terminus; many Interstates end at at-grade junctions–including I-587, at its other end.

[cl94]

I-587.

how is this allowed to be an interstate?

Why shouldn't it be?


iPhone

Better question: Why is Wyoming I-180 an Interstate?

another good question that no one has given me a good answer to.

But my question is why wouldn't they be? In I-180's case, that's obvious: Interstate aren't supposed to have intersections. But what's the reason with I-587? What characteristics does it have that Interstates aren't "supposed to" have?

What you just said, it has an at grade intersection, a roundabout

That's at the terminus; many Interstates end at at-grade junctions–including I-587, at its other end.

His point is that it doesn't have an Interstate grade connection to its parent

[NE2]

His point is that it doesn't have an Interstate grade connection to its parent

Neither does I-376. What, you thought the Monroeville interchange was built to modern Interstate standards?

[empirestate]

I-587.

how is this allowed to be an interstate?

Why shouldn't it be?


iPhone

Better question: Why is Wyoming I-180 an Interstate?

another good question that no one has given me a good answer to.

But my question is why wouldn't they be? In I-180's case, that's obvious: Interstate aren't supposed to have intersections. But what's the reason with I-587? What characteristics does it have that Interstates aren't "supposed to" have?

What you just said, it has an at grade intersection, a roundabout

That's at the terminus; many Interstates end at at-grade junctions–including I-587, at its other end.

His point is that it doesn't have an Interstate grade connection to its parent

Is that a requirement for being an Interstate? Again, I-587 isn't unique in that respect.

[vdeane]

His point is that it doesn't have an Interstate grade connection to its parent

Neither does I-376. What, you thought the Monroeville interchange was built to modern Interstate standards?

It's at least freeway-freeway.  I-587 requires traffic from I-87 to go through a roundabout.

[NE2]

It's at least freeway-freeway.  I-587 requires traffic from I-87 to go through a roundabout.

How is a roundabout not freeway-to-freeway? All you have to do is yield.

[empirestate]

It's at least freeway-freeway.  I-587 requires traffic from I-87 to go through a roundabout.

How is a roundabout not freeway-to-freeway? All you have to do is yield.

And if it isn't, does that disqualify I-587 from being an Interstate?

[national highway 1]

Northern end of the M1 Pacific Mwy at Beresfield, NSW
https://www.google.com.au/maps/@-32.8138592,151.6351183,18.5z

[wanderer2575]

Western terminus of Autoroute 640 west of Montreal.

https://goo.gl/maps/rkJqYv4te5r

[Beeper1]

MA-2 in Concord might count.

[BigRTM]

The western end of SR-60 ends @ a roundabout in Clearwater Beach in FL.

[froggie]

The western end of SR-60 ends @ a roundabout in Clearwater Beach in FL.

But SR-60 isn't a freeway.  We're talking about freeways that end at roundabouts here.

[BigRTM]

The western end of SR-60 ends @ a roundabout in Clearwater Beach in FL.

But SR-60 isn't a freeway.  We're talking about freeways that end at roundabouts here.

Oh yeah. Ha, was thinking of a highway instead of a freeway.

[plain]

I-70 in Maryland    or at least it might as well be

[mgk920]

I don't think this is very common, but US 53 is a freeway that ends at a roundabout in Eau Claire, WI.  US 10 in Marshfield is also a freeway/expressway that ends at a roundabout.  Changes were recently made to the US 53/Old Town Hall Rd roundabout which included adding rumble strips and installing a mound in the roundabout circle because there were a lot of crashes, I'm guessing because people don't expect to see a roundabout while driving down a freeway.  Before the roundabout, US 53 transitioned into a 2 lane rural roadway and the intersection was just a rural intersection.  A retail store was built in the area and developers wanted to develop the area, so a roundabout was built in anticipation of new development at the intersection.

In my opinion, I don't think it's a good idea to have a roundabout at the end of a high speed roadway since people don't expect to see a roundabout on a road signed at 65 mph in a rural setting. 





Here is an article on the recent improvements:
http://www.leadertelegram.com/News/Daily-Updates/2016/06/13/State-to-improve-U-S-53-roundabout.html

An aside here, if I were the WisDOT highway Poo-Bah I would separate the US 53 freeway to the north from the existing US 53 highway to the south, feeding the freeway to the north directly into I-94 with direct free-flowing ramps and directly feeding the US 53 surface road (now 'street') to the south into surface streets to the north.  That ancient cloverleaf interchange is one of my top 'weak spots' in the entire Wisconsin transportation network.

Mike