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Recommended Ramp Design Procedures for Facilities Without Frontage Roads.
| 题名： | Recommended Ramp Design Procedures for Facilities Without Frontage Roads. |
| 作者： | bonneson, j. zimmerman, k. messer, c. wooldridge, m. |
| 关键词： | frontage roads,ramps,design criteria,controlled access highways,texas department of transportation and development (txdot) |
| 摘要： | Based on a recent change in Texas Department of Transportation (TxDOT) policy, frontage roads are not to be included along controlled-access highways unless a study indicates that the frontage road improves safety, improves operations, lowers overall facility costs, or provides essential access. Interchange design options that do not include frontage roads are to be considered for all new freeway construction. Ramps in nonfrontage- road settings can be more challenging to design than those in frontage-road settings for several reasons. Adequate ramp length, appropriate horizontal and vertical curvature, and flaring to increase storage area at the crossroad intersection should all be used to design safe and efficient ramps for non-frontage-road settings. However, current design procedures available in standard TxDOT reference documents focus on ramp design for frontage-road settings. The objective of this research project was to develop recommended design procedures for interchange ramps on facilities without frontage roads. This report describes design procedures for interchange ramps on facilities without frontage roads. The procedures described include models for evaluating the operational and safety benefits of alternative ramp configurations. They also include guidelines for designing ramps of adequate length, appropriate horizontal and vertical curvature, and reasonable accommodation of larger vehicles. |
| 报告类型： | 科技报告 |
相关文献
- Development of Ramp Design Procedures for Facilities Withough Frontage Roads. Technical rept. Sept 2002-Aug 2004.
- Review and Evaluation of Interchange Ramp Design Considerations for Facilities without Frontage Roads.
- Freeway Design Decisions For Revised Frontage Road Policy: Final Project Report.
- Freeway Design Decisions For Revised Frontage Road Policy: Final Project Report.
- DEVELOPMENT OF IMPROVED GUIDELINES FOR FRONTAGE ROAD DRIVEWAY ACCESS AT ENTRANCE RAMP LOCATIONS
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