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Passing Sight Distance Criteria.
| 题名： | Passing Sight Distance Criteria. |
| 作者： | harwood, d. w. gilmore, d. k. richard, k. r. dunn, j. m. sun, c. |
| 关键词： | visibility, marking, revisions, recommendations, accident data, criteria, mathematical models, highway characteristics |
| 摘要： | The operational efficiency of many two-lane highways depends on the opportunity for faster drivers to pass slower drivers. Where faster drivers encounter a slower driver and are unable to pass, platoons form and the level of service of the two-lane highway deteriorates. Passing Sight Distance (PSD) is provided in the design of two-lane highways to provide opportunities for faster drivers to pass where gaps in opposing traffic permit. Passing and nopassing zones are marked in the centerline of two-lane highways to indicate where it is legal for drivers to make such passing maneuvers. PSD design for two-lane highways is based on criteria in the AASHTO Green Book that were derived from older data and have been unchanged for many years. Marking of passing and no-passing zones are based on PSD criteria presented in the Manual on Uniform Traffic Control Devices (MUTCD). The MUTCD criteria are based on the values in a 1940 AASHO guide and represent a subjective compromise between sight distances computed for flying passes and sight distances computed for delayed passes. The marking PSD criteria are substantially less than the PSD criteria used in design. The MUTCD also provides guidance on minimum passing zone length of 120 m (400 ft) by stating that, where successive no-passing zones come within 120 m (400 ft) of one another, the no-passing-zone marking should be continued between them. A number of alternative PSD models were reviewed in the research. The alternative models that appear to most appropriately represent the PSD needs of passing drivers are those developed by Glennon and Hassan et al. Both of these models recognize that, in the early stages of a passing maneuver, the passing driver can easily and safely abort the passing maneuver. / Supplementary Notes: Prepared in cooperation with Midwest Research Inst., Kansas City, MO. and Missouri Univ.-Columbia. Sponsored by American Association of State Highway and Transportation Officials, Washington, DC. and Federal Highway Administration, Washington, DC. / Availability Note: Product reproduced from digital image. 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 5285 Port Royal Road, Springfield, VA, 22161, USA. |
| 总页数： | u0820；95p |
| 报告类型： | 科技报告 |
相关文献
- DESIGN CONSIDERATIONS FOR PASSING SIGHT DISTANCE AND PASSING ZONES.
- ASSESSING THE NEEDED PASSING SIGHT DISTANCE.
- DETERMINING THE BEST METHOD FOR MEASURING NO-PASSING ZONES.
- EVALUATION OF THE PASSING PROCESS ON TWO-LANE RURAL HIGHWAYS.
- Automated Calculation of Passing Sight Distance Using Global Positioning System Data
- Influence of Sight Distance on Traffic Accident Reconstruction Engineering, 2nd Edition.
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