Table HM-36 – Office of Highway Policy Information (OHPI) – FHWA

Highway Statistics Series

Highway Statistics 1998

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FEDERAL-AID HIGHWAY LENGTH – 1998 1/

MILES BY TRAFFIC LANES AND ACCESS CONTROL

OCTOBER 1999
TABLE HM-36

TRAFFIC LANES AND ACCESS CONTROL	NATIONAL HIGHWAY SYSTEM						OTHER FEDERAL - AID HIGHWAYS 2/		ALL FEDERAL-AID HIGHWAYS 2/
	INTERSTATE		OTHER		TOTAL		OTHER FEDERAL - AID HIGHWAYS 2/		ALL FEDERAL-AID HIGHWAYS 2/
	MILES	PERCENT	MILES	PERCENT	MILES	PERCENT	MILES	PERCENT	MILES	PERCENT
Rural:
One-way streets	2	0.0	104	0.1	106	0.1	346	0.1	452	0.1
2 lanes	998	3.0	59,750	69.8	60,748	51.3	568,560	97.7	629,309	89.8
3 lanes	19	0.1	1,736	2.0	1,755	1.5	1,315	0.2	3,069	0.4
4 or more lanes:	22	0.1	4,063	4.7	4,085	3.4	4,568	0.8	8,653	1.2
Divided highways - 4 or more lanes: 3/
Degree of access control:
None	17	0.1	9,667	11.3	9,684	8.2	5,890	1.0	15,574	2.2
Partial	42	0.1	5,450	6.4	5,492	4.6	1,196	0.2	6,688	1.0
Full	31,812	96.7	4,846	5.7	36,657	30.9	217	0.0	36,875	5.3
Total Rural	32,912	100.0	85,615	100.0	118,527	100.0	582,092	100.0	700,619	100.0
Small urban area:
One-way streets	0	0.0	133	2.2	133	1.7	598	1.2	731	1.3
2 lanes	3	0.2	1,959	32.8	1,962	25.4	40,870	84.0	42,832	76.0
3 lanes	0	0.0	98	1.6	98	1.3	432	0.9	492	0.9
4 or more lanes - undivided	0	0.0	1,269	21.2	1,269	16.4	4,353	8.9	5,622	10.0
Divided highways - 4 or more lanes:
Degree of access control:
None	1	0.0	1,052	17.6	1,052	13.6	1,899	3.9	2,996	5.3
Partial	11	0.6	775	13.0	786	10.2	430	0.9	1,217	2.2
Full	1,716	99.1	696	11.6	2,413	31.3	68	0.1	2,481	4.4
Total Small Urban Area	1,732	100.0	5,981	100.0	7,713	100.0	48,650	100.0	56,370	100.0
Urbanized Area:
One-way streets	6	0.1	512	2.3	519	1.5	4,219	2.6	4,738	2.4
2 lanes	13	0.1	4,385	19.8	4,397	13.0	113,812	70.2	118,827	60.5
3 lanes	13	0.1	213	1.0	225	0.7	1,577	1.0	1,803	0.9
4 or more lanes - undivided 3/	25	0.2	4,322	19.5	4,347	12.8	21,838	13.5	26,186	13.3
Divided highways - 4 or more lanes:
Degree of access control:
None	23	0.2	4,841	21.8	4,864	14.4	16,907	10.4	21,770	11.1
Partial	32	0.3	2,642	11.9	2,674	7.9	3,008	1.9	5,682	2.9
Full	11,579	99.0	5,248	23.7	16,826	49.7	677	0.4	17,503	8.9
Total Urbanized Area	11,690	100.0	22,162	100.0	33,852	100.0	162,038	100.0	196,509	100.0
Total Urban:
One-way streets	6	0.0	645	2.3	652	1.6	4,817	2.3	5,469	2.2
2 lanes	16	0.1	6,344	22.5	6,360	15.3	154,681	73.4	161,659	63.9
3 lanes	13	0.1	310	1.1	323	0.8	2,009	1.0	2,295	0.9
4 or more lanes - undivided	25	0.2	5,591	19.9	5,616	13.5	26,191	12.4	31,807	12.6
Divided highways - 4 or more lanes:
Degree of access control:
None	23	0.2	5,893	20.9	5,916	14.2	18,805	8.9	24,766	9.8
Partial	43	0.3	3,417	12.1	3,460	8.3	3,439	1.6	6,899	2.7
Full	13,295	99.1	5,944	21.1	19,239	46.3	745	0.4	19,984	7.9
Total Urban	13,422	100.0	28,143	100.0	41,565	100.0	210,688	100.0	252,879	100.0
Total Rural and Urban	46,334	*	113,759	*	160,092	*	792,781	*	953,498	*

1/ Includes the 50 States, the District of Columbia, and Puerto Rico.

2/ Traffic lanes: Reflects the prevailing number of lanes (excluding parking and turning lanes) carrying through traffic during the off-peak period. Access Control: Full Access Control – preference has been given to through traffic movements by providing interchanges with selected public roads and by prohibiting direct driveway connections. Partial Access Control*preference has been given to through traffic movement. In addition to possible interchanges there may be some crossings at grade with public roads, but direct private driveway connections have been minimized.

3/ Although the Interstate System is part of the National Highway System, its mileage is shown separately.

4/ Some differences from other tables may be noted because these are estimated from sample data and do not include structures.

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Page last modified on November 7, 2014