Which long haul interstate shares the least amount of pavement?

[bassoon1986]

I-10:


CA: SR 1 (0.96), I-5 (2.77), US 95 (3.32) Total: 7.05/243.31
AZ: US 95 (17.54), US 60 (5.68), US 191 (20.78) Total: 44/391.99
NM: Combination of US 70, US 180, and US 85 concurrencies, Total: 139.7/164.26
TX: US 180 (24), SH 17 (2.5), US 67 (24.5), US 83 (9.1), US 87 (54.1, includes briefly I-35), US 90 (114.6, not including part counted with US 87, multiple sections), SH 130 (10.9 separate from US 90), SH 71 (1.8), US 69/US 96/US 287 (1.5 separate from US 90) Total: 243/879.6
LA: US 90 (9.8) Total: 9.8/273.6
MS: 0/77
AL: 0/66.27
FL: US 17 (1.01) Total: 1.01/362.06

Grand Total: 444.56/2460.34=18.07% concurrent

I just did I-10 as well. Crazy that only about 10 miles of anything are concurrent with I-10 once you get east of Texas.


iPhone

[TheStranger]

Interstate 40

2559.25 miles

California: 4 miles for San Bernardino County Route 66, 11 miles for US 95 = 15 miles total
Arizona: 23 miles for US 93, 84 miles for US 180 (including 7 miles for SR 99), 6 miles for SR 77, 6 miles for US 191 = 119 miles total
New Mexico: 77 miles of concurrency (21 for US 84, 56 miles for US 54)
Texas: 8 miles for US 287, 3 miles for SH 70 = 11 miles total
Oklahoma: 9 miles for OK 34, 66 miles for US 270 (including short concurrencies with I-35, US 62, OK 3, and OK 102), 5 miles for OK 3E, 19 miles for US 62 (including 9 miles of US 75) = 99 miles total
Arkansas: 6 miles of US 71, 28 miles of US 65, 2 miles of US 67/US 167, 84 miles of (unsigned) US 63, 2 miles of I-55/US 61/US 64 = 122 miles concurrent (including US 63), 39 miles total without US 63.
Tennessee: approximately 3 miles for I-69, 2 miles for I-65, 2 miles for I-24, 7 miles for TN 56, 2 miles for TN 299, 4 miles for TN 58, 17 miles for I-75, 1 mile for US 25W (TN 9), 8 miles for Tn 66 = 46 miles total
North Carolina: 19 miles for US 74, 7 miles for US 70, 6 miles for US 421, 5 miles for US 220 (including portions of US 29 and US 70), 32 miles for I-85, 8 miles for US 64, 3 miles for US 70, 9 miles for NC 24 = 89 miles total

INCLUDING US 63: 578 miles concurrent, 22.6%
EXCLUDING US 63: 494 miles concurrent, 19.3%