Interstate designations that maintain the through movement

[amroad17]

It seems to do so.

We need a trollface smiley, don't we. I-478, I-678, I-878, sure.

I give out one: .

You Mad?

[Duke87]

I'd argue that I-81 near Lebanon, PA is graded as if I-78 was the through movement and therefore wouldn't qualify.

I suppose it could be an arguable point... though I'd firmly side with I-81 being the through movement.  Mostly cause of the striping & signage.

If you go by striping, both lanes leading up to the split continue as I-78 east, while the two lanes for I-81 north both begin to the left leading up to the interchange. This makes 78 much more "through"... which makes sense since that's the way most traffic goes.

This, I suppose, gives us a standard objective test as to whether a road continues "through". The key question is: is it possible in theory (neglecting work zones, accident sites, etc.) to drive the entire length of the route without ever changing lanes? If the answer is no, then the route is not purely through.
Although I will grant you, the answer could be no without there being a split that doesn't favor the route... and it could also be yes with. So it is a somewhat different question.

[mgk920]

I-41 will when it is designated next year.

Mike