原文传递
Guidelines for Spacing Between Freeway Ramps.
| 题名： | Guidelines for Spacing Between Freeway Ramps. |
| 作者： | K. Fitzpatrick; R. J. Porter; G. Pesti; C. L. Chu; E. S. Park; |
| 关键词： | freeway operations,ramp spacing,speed;weaving, vehicle operations, recommendations; |
| 摘要： | Existing geometric design guidance related to interchange ramp spacing in the Texas Roadway Design Manual and the AASHTOs A Policy on Geometric Design of Highways and Streets (Green Book) is not speed-dependent even though intuition indicates spacing and speed are related. Understanding the relationship between interchange ramp spacing, speed, and freeway operations is important, especially in developing potential design values for higher speeds (e.g., 85 to 100 mph). The objectives of this project were to: (1) investigate relationships between weaving length, speed, and overall vehicle operations on Texas freeways and (2) propose updates to current Texas Department of Transportation guidance on recommended distances between ramps. Within the research tasks several methods were utilized to assist in developing guidance on ramp spacing lengths. The methods or resources used to generate potential lengths included: guidance provided in Design Manual for Roads and Bridges published by the Highways Agency in England, minimum deceleration and acceleration length for freeway conditions, decision sight distance, sign spacing needs, NCHRP project 3-75 findings, findings from field studies at seven study sites, findings from simulation conducted as part of this research, and safety relationships identified in the literature. Suggested ramp spacings were developed for the entrance ramp to exit ramp and exit ramp to exit ramp conditions. / Title Note: Technical rept. / Supplementary Notes: Sponsored by Texas Dept. of Transportation, Austin. Research and Technology Implementation Office. and Federal Highway Administration, Austin, TX. Texas Div. / Availability Note: Order this product from NTIS by: phone at 1-800-553-NTIS (U.S. customers); (703)605-6000 (other countries); fax at (703)605-6900; and email at orders@ntis.gov. NTIS is located at 5301 Shawnee Road, Alexandria, VA, 22312, USA. / NTIS Prices: PC A07 / NTIS In-house Control Codes: utatti/dotfha;12091,1101 |
| 报告类型： | 科技报告 |
相关文献
- DEVELOPMENT OF IMPROVED GUIDELINES FOR FRONTAGE ROAD DRIVEWAY ACCESS AT ENTRANCE RAMP LOCATIONS
- Speeds on Houston Freeway Connector Ramps Show Variations By Vehicle Type. Project summary rept.
- Speeds on Houston Freeway Connector Ramps Show Variations By Vehicle Type.
- RAMP-METERING DESIGN AND OPERATIONS GUIDELINES FOR TEXAS
- Phase 2 - Improved Work Zone Design Guidelines and Enhanced Model of Travel Delays in Work Zones. Part I: Development of Digital Computer Simulation Model. Part II: Baseline Free-Flow Measurements for Diversion Analysis. Part III: Development of Design Gu
- Managed Lane Strategies Feasible for Freeway Ramp Applications.
检索历史
应用推荐
