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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
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.