Twin Trailer Trucks Special Report 211 (1986) / Chapter Skim
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Preface Through the Surface Transportation Assistance Act of 1982, the US. Congress required states to permit truck-tractors pulling twin 28-ft trailers on Interstate highways and other principal roads.
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vi PREFACE mary way, but because route structures and shipment characteristics may create regional disparities in the use of twins that are not currently documented, more detailed regional comparisons of accident experience were not possible. The safety performance of twin trailer trucks compared with that of other large trucks tends to be obscured by confounding factors, including differences in typical driver qualifications, highway routes, loadings, fraction of nighttime driving, and carrier safety practices.
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