State Highway Agency (SHA) Miles — 23rd Annual Highway Report

State highway agency roads are generally the Interstates and other major US-numbered and state-numbered roads. A few states also manage major portions of the rural road system. In 2015, about 779,457 miles were the responsibility of the 50 State Highway Agencies (Table 6, State Highway Agency Mileage), about 222 more miles than in 2013 (779,235), the last time this assessment was completed. The average number of lanes per mile is 2.40 lanes, but a few states (New Jersey, Florida, California and Massachusetts) manage significantly wider roads, averaging more than 3.0 lanes per mile.

State Highway Agency Mileage, by average number of lanes/mile

Rank	State	SHA Miles	SHA Lane-Miles	Ratio
1	West Virginia	34,403	70,987	2.06
2	Maine	8,358	17,548	2.1
3	Alaska	5,611	11,906	2.12
4	New Hampshire	3,902	8,405	2.15
5	North Carolina	79,559	171,687	2.16
6	Virginia	58,648	127,258	2.17
7	South Carolina	41,359	90,465	2.19
8	Delaware	5,402	11,859	2.2
9	Pennsylvania	39,756	88,297	2.22
10	Kentucky	27,636	61,987	2.24
11	Missouri	33,873	76,289	2.25
12	Nebraska	9,941	22,508	2.26
13	Montana	11,014	25,125	2.28
14	Vermont	2,629	6,003	2.28
15	Arkansas	16,423	37,640	2.29
16	South Dakota	7,766	17,921	2.31
17	North Dakota	7,406	17,217	2.32
18	Kansas	10,292	23,996	2.33
19	Wyoming	6,718	15,726	2.34
20	Louisiana	16,689	39,332	2.36
21	Oregon	7,661	18,594	2.43
22	Texas	80,423	195,756	2.43
23	New Mexico	11,976	29,504	2.46
24	Idaho	4,992	12,341	2.47
25	Oklahoma	12,257	30,356	2.48
26	Minnesota	11,811	29,260	2.48
27	Wisconsin	11,746	29,669	2.53
28	Nevada	5,380	13,598	2.53
29	Colorado	9,061	22,928	2.53
30	New York	15,049	38,320	2.55
31	Iowa	8,880	22,739	2.56
32	Ohio	19,228	49,416	2.57
33	Mississippi	10,901	28,075	2.58
34	Indiana	11,169	28,769	2.58
35	Rhode Island	1,091	2,848	2.61
36	Washington	7,058	18,478	2.62
37	Hawaii	942	2,487	2.64
38	Connecticut	3,720	9,832	2.64
39	Illinois	15,967	42,235	2.65
40	Tennessee	13,878	37,220	2.68
41	Alabama	10,920	29,568	2.71
42	Georgia	17,949	49,074	2.73
43	Utah	5,871	16,127	2.75
44	Michigan	9,668	27,444	2.84
45	Maryland	5,154	14,763	2.86
46	Arizona	6,822	19,612	2.87
47	Massachusetts	2,945	9,302	3.16
48	California	15,093	51,686	3.42
49	Florida	12,116	43,759	3.61
50	New Jersey	2,340	8,555	3.66
	U.S. Total	779,457	1,874,470	2.4
	Weighted Average	15,589	37,489

23rd Annual Highway Report

Complete Report PDF (HTML)
Complete State-by-State Summaries PDF