Urban interstates that end abruptly

[KCRoadFan]

And what about I-585 in Spartanburg, SC? That's the other example I've seen cited of traffic lights on interstates.

[vdeane]

Which itself is a trivia question answer. I-78 is the only Interstate other than I-70 to continue through signalized intersections, because the one-way pair it follows in Jersey City has several of them.

You've offended poor I-180 in Wyoming!

As for I-676, I thought that was recognized by one DOT but not another.  You could even make the "discontinuous" argument for I-70, given the way it's signed as US 30 TO I-70.  Of course, if you let signing be a deciding factor, that hurts the case for I-78, because last time I checked, it ceases to be signed where the freeway ends.

I had always thought that PennDOT just had it wrong and that the interstate still went to the bridge, but it appears that FHWA agrees with them.

[silverback1065]

what's up with the interstates around Greenville, SC? it's like they tried to build a beltway but got drunk and forgot what a circle was and gave up. 

Spartanburgs make no sense either, why does bus 85 even exist at all? and did they just not feel like finishing 585?

[dlsterner]

what's up with the interstates around Greenville, SC? it's like they tried to build a beltway but got drunk and forgot what a circle was and gave up. 

Spartanburgs make no sense either, why does bus 85 even exist at all? and did they just not feel like finishing 585?

In Spartanburg's case, the route that is now Business I-85 was the original mainline I-85 (so that I-585 did indeed connect with I-85 back then).  It was around 1995 that the "bypass" was constructed, with I-85 being relocated to it, and Business I-85 being created.