Business routes that don't return to the mainline

[froggie]

it is, indeed, probably the truest example of a business spur on the interstate system.  it continues straight as I-20 ends at I-95, making a perfect 180 degree angle with the road it shares a number with.

BS-526 in Mt. Pleasant, SC would also fit that bill.

[Kacie Jane]

Not a business route, but since there've been a couple of Alternates mentioned, I figured I'd add this one in.

Bypass US 16 in Rapid City, SD, doesn't return to its parent because it's located at its eastern terminus.  Mainline 16 runs through Rapid City to end at I-90. Bypass 16 bypasses it to the east and ends at a separate interchange a couple of miles further  east.

[NE2]

South Carolina likes those (I-126, I-385, I-585 also have them, I believe).

[1995hoo]

That's because it's actually a business spur, not a loop.

Ah so. As I said, been awhile since I've been through there and I didn't recall that it was signed as a spur. But from looking at the map it makes eminent sense.

[mightyace]

Bypass US 16 in Rapid City, SD, doesn't return to its parent because it's located at its eastern terminus.  Mainline 16 runs through Rapid City to end at I-90. Bypass 16 bypasses it to the east and ends at a separate interchange a couple of miles further  east.

Of course, US 16 used to go much farther east into Minnesota and Wisconsin and I think that US 16 was duplexed with I-90 at the time it was decommissioned.

Also, even though it doesn't meet back up with the current alignment of US 16, it DOES still function as a bypass of Rapid City for traffic to the east and still, IMO, fulfills the function of its banner.

[corco]

Not a business route, but since there've been a couple of Alternates mentioned, I figured I'd add this one in.

Bypass US 16 in Rapid City, SD, doesn't return to its parent because it's located at its eastern terminus.  Mainline 16 runs through Rapid City to end at I-90. Bypass 16 bypasses it to the east and ends at a separate interchange a couple of miles further  east.

It's actually signed at least once along I-90 to the US-16 junction (believe it or not- I was shocked too when I saw it), so it does return to its parent

[Kacie Jane]

Bypass US 16 in Rapid City, SD, doesn't return to its parent because it's located at its eastern terminus.  Mainline 16 runs through Rapid City to end at I-90. Bypass 16 bypasses it to the east and ends at a separate interchange a couple of miles further  east.

Of course, US 16 used to go much farther east into Minnesota and Wisconsin and I think that US 16 was duplexed with I-90 at the time it was decommissioned.

Also, even though it doesn't meet back up with the current alignment of US 16, it DOES still function as a bypass of Rapid City for traffic to the east and still, IMO, fulfills the function of its banner.

I knew this (did not know that it was signed along I-90 to end back at mainline 16, however), and it certainly does fulfill the purpose of a bypass.  I did want to include it as a special case of a route not returning to its parent, though -- just because it doesn't return to its parent doesn't necessarily mean it doesn't serve its purpose.

[Kacie Jane]

That's because it's actually a business spur, not a loop.

it is, indeed, probably the truest example of a business spur on the interstate system.  it continues straight as I-20 ends at I-95, making a perfect 180 degree angle with the road it shares a number with.

While I don't necessarily disagree that they should be signed as business spurs, I would disagree that they're the "truest examples" of such.  A spur by definition should be a branch off a mainline, not an extension of it.  The truest example of a business spur that I can think of off the top of my head is actually one that isn't signed as one... I-180 in Cheyenne.