Following is a tabulation of highway miles that have been
posted with a weight restriction or speed limit each spring since 1969.
|
Year |
6 Ton/Axle |
7 Ton/Axle |
Total Posted Mileage |
Total Centerline Mileage |
% of Total Mileage Posted |
Legal & 40 MPH |
|---|---|---|---|---|---|---|
|
1969 |
1297 |
3282 |
4597 |
7313 |
65% |
|
|
1970 |
1009 |
2724 |
3733 |
7383 |
51% |
930 |
|
1971 |
932 |
2764 |
3696 |
7416 |
50% |
1000 |
|
1972 |
999 |
2199 |
3198 |
7486 |
43% |
1550 |
|
1973 |
1116 |
1993 |
3109 |
7530 |
41% |
1681 |
|
1974 |
1233 |
1774 |
3007 |
7545 |
40% |
1795 |
|
1975 |
1194 |
1733 |
2927 |
7721 |
38% |
2049 |
|
1976 |
1119 |
1605 |
2724 |
7770 |
35% |
2227 |
|
1977 |
1119 |
1539 |
2658 |
7832 |
34% |
2380 |
|
1978 |
1035 |
1451 |
2486 |
7832 |
32% |
2476 |
|
1979 |
912 |
1425 |
2337 |
7841 |
30% |
2345 |
|
1980 |
795 |
998 |
1793 |
7841 |
23% |
941 |
|
1981 |
814 |
722 |
1536 |
7832 |
20% |
|
|
1982 |
847 |
731 |
1578 |
7894 |
20% |
|
|
1983 |
909 |
587 |
1496 |
7855 |
19% |
|
|
1984 |
917 |
660 |
1577 |
7855 |
20% |
|
|
1985 |
1035 |
443 |
1478 |
7869 |
19% |
|
|
1986 |
1036 |
392 |
1428 |
7869 |
18% |
|
|
1987 |
952 |
420 |
1372 |
7869 |
17% |
|
|
1988 |
814 |
481 |
1295 |
7867 |
16% |
|
|
1989 |
773 |
477 |
1250 |
7875 |
16% |
|
|
1990 |
693 |
482 |
1175 |
7877 |
15% |
|
|
1991 |
679 |
444 |
1123 |
7876 |
14% |
|
|
1992 |
501.5 |
482.8 |
984.3 |
7857 |
12.5% |
|
|
1993 |
458.1 |
483.1 |
941.2 |
7844 |
12.0% |
|
|
1994 |
418.2 |
448.3 |
866.5 |
7836 |
11.1% |
|
|
1995 |
412.9 |
453.5 |
866.4 |
7837 |
11.1% |
|
|
1996 |
653.2 |
343.3 |
996.5 |
7833 |
12.7% |
|
|
1997 |
651.7 |
304.1 |
955.8 |
7832 |
12.2% |
|
|
1998 |
577.6 |
316.6 |
894.2 |
7830 |
11.4% |
|
|
1999 |
560.1 |
352.2 |
912.3 |
7807 |
11.7% |
|
|
2000 |
511.5 |
301.8 |
813.3 |
7793 |
10.4% |
|
|
2001 |
389.0 |
303.7 |
692.7 |
7793 |
8.9% |
|
| 2002 | 308.9 | 291.4 | 600.3 | 7793 | 7.7% | |
| 2003 |
268.9 |
276.6 | 545.5 | 7793 |
7.0% |
|
| 2004 | 241.7 | 282.2 | 523.9 | 7788 | 6.7% | |
| 2005 | 144.8 | 225.9 | 370.7 | 7788 | 4.8% | |
| 2006 | 115.1 | 187.4 | 302.5 | 7788 | 3.9% | |
| 2007 | 108.9 | 161.9 | 270.8 | 7788 | 3.5% | |
| 2008 | 168.7 | 158.7 | 267.6 | 7788 | 3.4% |
Except for in 1982, 1984 and 1996, the posted mileage has decreased over each preceding year. In 1982 and 1984, a number of perimeter roads were added to the highway system. In 1996, the increase in mileage posted can be attributed to the use of scientific data from Falling-Weight Deflectometer testing that indicated a greater number of highway miles were weak and required posting. In 1970, at the suggestion of the trucking industry, we tried a speed reduction to 40 MPH instead of a weight reduction on some highways. In 1972, we expanded the number of highways with a speed reduction by several hundred miles. In 1981, due to the 55 MPH speed limit and what we felt was a small difference between 40 MPH and 55 MPH, we eliminated the speed reduction posting entirely.
Return to Spring Load Limits page.