Greatest disparity in route numbers that intersect

[RobbieL2415]

In the Northeast, there aren't really any huge ones. US 1 and US 13, I-80 and I-90. I-83 doesn't quite reach I-95. US 46 is way off the grid, but doesn't cross any even numbered US routes.

US 6 and US 44 intersect in both Hartford and Providence.

Don't forget MA/CT 10 and US 202.

[kkt]

In the Northeast, there aren't really any huge ones. US 1 and US 13, I-80 and I-90. I-83 doesn't quite reach I-95. US 46 is way off the grid, but doesn't cross any even numbered US routes.

US 6 and US 44 intersect in both Hartford and Providence.

Don't forget MA/CT 10 and US 202.

Pretty sure we established that the OP is looking for disparities within a single grid, not mixing state/US grids.

[cl94]

In the Northeast, there aren't really any huge ones. US 1 and US 13, I-80 and I-90. I-83 doesn't quite reach I-95. US 46 is way off the grid, but doesn't cross any even numbered US routes.

US 6 and US 44 intersect in both Hartford and Providence.

Don't forget MA/CT 10 and US 202.

Pretty sure we established that the OP is looking for disparities within a single grid, not mixing state/US grids.

Yes. Single grid, not mixing even/odd. In the spirit of that, I assume that we should exclude spurs, as they break the grid. US 202 and US 2 is a big disparity, but not really if you know that  US 202 is the second spur of US 2.