Oregon and Idaho's 1957/8 push to rename Interstate 82 (and Interstate 82N & S)

[Henry]

IMO, for what it is worth, I-84 was the best possible number to give to the regional Interstate that was previously designated as I-80N.  If you look at the grid, E-W Interstate highways that end in a "4" are long/important routes that don't quite earn ending in a "0", but longer and more important than routes that end in "2", "6", or "8".  For example, I-24, I-44, I-64, I-74, the eastern I-84 and I-94 are all important routes that serve multiple regions.  Western I-84 fits this criteria perfectly. 

OT: What would be the N-S equivalent to this (as in, those that don't end in 5 and still more important than the others)? I tend to think the 9's would fit best, as I-29, I-39, I-49, I-59, I-69, I-79, I-89 and I-99 span multiple states (I-19 only exists in AZ, but acts as a gateway to Mexico).

[vdeane]

IMO, for what it is worth, I-84 was the best possible number to give to the regional Interstate that was previously designated as I-80N.  If you look at the grid, E-W Interstate highways that end in a "4" are long/important routes that don't quite earn ending in a "0", but longer and more important than routes that end in "2", "6", or "8".  For example, I-24, I-44, I-64, I-74, the eastern I-84 and I-94 are all important routes that serve multiple regions.  Western I-84 fits this criteria perfectly. 

OT: What would be the N-S equivalent to this (as in, those that don't end in 5 and still more important than the others)? I tend to think the 9's would fit best, as I-29, I-39, I-49, I-59, I-69, I-79, I-89 and I-99 span multiple states (I-19 only exists in AZ, but acts as a gateway to Mexico).

Most 2dis span multiple states.