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From page 9...
... Contents / EXECUTIVE SUMMARY ..............................................
From page 10...
... 4 SAFETY IMPACTS . 112 Factors Affecting Large-Truck Accidents, 113 Safety of Twins and of Longer and Wider Tractor- Semitrailers Compared with Other Combinations, 116 Recent Twin Trailer Truck Safety Experience, 135 Systemwide Safety Effects, 149 References, 155 5 HIGHWAY CONDITION, OPERATIONS, AND DESIGN IMPACTS ........157 Deterioration of Highway Facilities, 158 Highway Operations, 175 Highway Design and Construction, 177 Environment, 181 References, 183 6 LONG-TERM MONITOIUNG ............................................185 Applications and Types of Data Required, 187 Available Data Resources and Their Limits, 189 Recommendations for Improving Truck Data, 194 References, 199 7 SUMMARY AND CONCLUSIONS ........................................201 Effects of Nationwide Legalization of Twins, 201 Distribution of Benefits and Costs of Expanded Use of Twins, 204 Twins Safety in the Context of Overall Truck Safety, 206 Opportunities for Improving Truck Safety, 208 GLOSSARY OF TRUCKING AND HIGHWAY TERMS ........................212 APPENDIX A Sections of Highway Laws Relating to Truck Size and Weight..................................................................
From page 11...
... APPENDIX H Driver Survey Questionnaire . 349 APPENDIX I Pavement Effects of Different Vehicle Weights, Weight Distributions, and Axle Arrangements -- An Example .................356 APPENDIX J Effects of Twins and Other Large Trucks on Bridges and Culverts.................................................................

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