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Establishing Driveway Grades for New Jersey Highways. Volume 2: Sight Distance Standards. Final rept.
| 题名： | Establishing Driveway Grades for New Jersey Highways. Volume 2: Sight Distance Standards. Final rept. |
| 作者： | Shamsi-T.A.; Iqbal-S.; Reilly-G.; Sun-W.; Pignataro-L.J. |
| 关键词： | *Transportation-; *New-Jersey; *Driveway-grades.;Sight-distance; Standards-. |
| 摘要： | Currently, the New Jersey Department of Transportation standards for state highway driveway grades are based on American Association of State Highway and Transportation Officials (AASHTO) guidelines, which are based on engineering judgements rather than research. The design of driveways is of great importance in terms of both safety and capacity of the roadway and the driveway. This study was conducted to reevaluate the AASHTO standards by attempting to safely extend the permissible grades for driveways. The following objectives were addressed by the study: develop more liberal design standards than those in current practice develop new driveway grade standards based on computer simulation. A twofold approach was designed for the study. In the first volume of the two volume report (Volume I- Model Development), a computer simulation model was developed and applied to assist an engineer in selecting a driveway profile starting from the outside edge of the main roadway. The application of this approach is suggested for driveways in excess of 50 in length. The AutoCAD simulation model (AutoDrive) has five modules: (1) Input Module allows user to enter input variables; (2) Roadway Module draws roadway based on input variables; (3) Driveway Module draws driveway grades and inserts vertical curves; (4) Simulation Module places the design vehicle on driveway and performs simulation; and (5) Output Module computes critical design parameters and displays results. In the second volume of the report (Volume II-Sight Distance Standards), the engineer is offered limiting sight distances based on a passenger car both on the mainline and at the driveway entrance. This approach is suggested for driveways of any length, in conjunction with the Input Variables for the Model, found in Volume 1. |
| 报告类型： | 科技报告 |
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