Interstates that don't follow interstate standards

[PHLBOS]

I can't remember when one didn't have exit numbers.

Prior to 1987-88, I-95 from Peabody, MA to the NH State line had unnumbered exits and with the exception of the mid-1970s-era BGS' from MA 110 (current Exit 58) northward; the BGS' didn't have blank exit tabs either.

Prior to the early & mid-1990s, I-95 in PA (especially the Philly portion) had unnumbered exits as well with very few BGS' had blank exit tabs.

[NE2]

I-295 in Delaware still has no exit numbers. Someone snitch to the FHWA.

[route17fan]

Textbook example: I-93 through the White Mountains in New Hampshire.

What is it there? Narrow I'm guessing?

Very much so

Ahh but atleast it's divided so that's something. Hopefully one day I can drive there.

It is definitely worth the drive - especially in autumn

[roadfro]

Are exit numbers a required thing for Interstate highways?

I think they're now required on all freeways, but that's a recent MUTCD addition.

I don't think exit numbers are required because California didn't use them until 2002.

Also, many really short freeways do not have exit numbers either.  Examples include I-195 in Richmond, VA and I-564 in Norfolk, VA.

The MUTCD has included a standard since at least the Millennium Edition (2000) that states exit numbers shall be used on all freeway interchanges. 

The 2009 MUTCD introduced the language that reference-based exit numbering shall be used (eliminating consecutive exit numbers).

[Brandon]

Also 676's exits are unnumbered

So are I-865's.

As are I-180 (IL)'s.

[PurdueBill]

Also 676's exits are unnumbered

So are I-865's.

Almost no exit numbers, as long as you don't count the bizzaro Exit 0 that exists only in the world of this sign on 465 WB east of the 465/865 split.    There being no actual exit, just the default onto 65 NB, I wonder why not just "follow 865 west"?  Guess they have one template for all IND-area 465 multiplex jump-off signs, and that includes the exit number at the bottom!