Table TC-3 – Office of Highway Policy Information (OHPI) – FHWA

Highway Statistics Series

Highway Statistics 1998

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PERCENTAGE DISTRIBUTION OF TRAFFIC VOLUMES AND LOADINGS 1/

ON THE INTERSTATE SYSTEM

OCTOBER 1999
TABLE TC-3

YEAR	PASSENGER CARS BUSES AND LIGHT SINGLE-UNIT TRUCKS		HEAVY SINGLE-UNIT TRUCKS		3- AND 4-AXLE COMBINATION TRUCKS		5-AXLE 4-COMBINATION TRUCKS
YEAR	VOLUMNES	LOADINGS	VOLUMNES	LOADINGS	VOLUMNES	LOADINGS	VOLUMNES	LOADINGS
RURAL
1970	87	3	3	6	3	18	8	74
1971	87	4	3	6	2	16	8	75
1972	87	2	3	6	2	13	9	79
1973	86	2	3	6	2	11	9	81
1974	85	3	3	5	2	9	10	83
1975	85	3	3	5	2	9	11	83
1976	85	2	3	5	2	9	11	84
1977	84	3	3	5	2	6	12	87
1978	83	2	3	5	2	6	12	86
1979	82	3	3	4	2	5	13	88
1980	82	1	3	4	1	3	14	91
1981	81	2	3	3	2	4	14	91
1982	81	1	3	4	2	5	14	90
1983	81	1	3	3	2	4	15	92
1984	80	2	3	4	2	3	15	91
1985	80	1	3	3	2	4	15	92
1986	80	1	3	3	2	5	15	91
1987	80	1	3	3	2	4	15	92
1988	80	1	3	3	2	4	15	92
1989	80	1	3	3	2	4	15	92
1990	79	1	4	4	2	4	15	91
1991	79	2	4	4	2	4	14	90
1992	79	1	3	4	2	4	16	90
1993	78	1	4	5	2	3	16	91
1994	78	1	4	6	2	3	16	91
1995	77	1	4	6	2	4	17	90
1996	77	1	4	6	1	3	17	89
1997	76	1	4	6	1	3	18	89
1998	76	1	4	7	1	2	18	89
URBAN
1990	90	1	3	15	1	6	5	78
1991	90	2	3	15	1	5	6	79
1992	89	1	3	14	1	6	7	78
1993	88	2	3	15	1	5	7	78
1994	89	1	4	15	1	5	6	78
1995	88	2	4	14	1	5	7	79
1996	89	2	4	14	1	5	6	79
1997	88	3	4	14	1	4	7	78
1998	88	3	4	15	1	5	6	77

1/ Based on data from the Truck Weight Study which are collected by the States for varying time periods each year and are not adjusted to typify annual averages. Loadings are based on equivalent axle loads which are the damage to a pavement caused by a vehicle axle relative to an 80 kN (18,000 lb) force which represents a standard single axle.

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