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Measures for the Optimization of Subgrade and Pavement Design in the Reconstruction and Expansion of Highways 被引量:1
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作者 Weixiang Jiang 《Journal of Architectural Research and Development》 2022年第2期26-30,共5页
In comparison to the construction of modern highway engineering,several of China’s early pavement construction concerns,such as pavement collapse,are rather clear.Limited by historical and technical factors,the subgr... In comparison to the construction of modern highway engineering,several of China’s early pavement construction concerns,such as pavement collapse,are rather clear.Limited by historical and technical factors,the subgrade and pavement design for highways lacks scientificity,thus inducing potential safety problems in the operation.In order to comprehensively improve the subgrade and pavement design as well as ensure the quality and safety of highway engineering projects,this paper takes the reconstructed and expanded highway projects as research subjects and focuses on proposing optimization measures for the subgrade and pavement design of reconstructed and expanded highways,so as to provide adequate reference. 展开更多
关键词 Reconstructed and expanded highway Subgrade and pavement Design issues Measures for optimization
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Application of artificial neural networks for operating speed prediction at horizontal curves: a case study in Egypt 被引量:5
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作者 Ahmed Mohamed Semeida 《Journal of Modern Transportation》 2014年第1期20-29,共10页
Horizontal alignment greatly affects the speedof vehicles at rural roads. Therefore, it is necessary toanalyze and predict vehicles speed on curve sections.Numerous studies took rural two-lane as research subjectsand ... Horizontal alignment greatly affects the speedof vehicles at rural roads. Therefore, it is necessary toanalyze and predict vehicles speed on curve sections.Numerous studies took rural two-lane as research subjectsand provided models for predicting operating speeds.However, less attention has been paid to multi-lane highwaysespecially in Egypt. In this research, field operatingspeed data of both cars and trucks on 78 curve sections offour multi-lane highways is collected. With the data, correlationbetween operating speed (V85) and alignment isanalyzed. The paper includes two separate relevant analyses.The first analysis uses the regression models toinvestigate the relationships between V85 as dependentvariable, and horizontal alignment and roadway factors asindependent variables. This analysis proposes two predictingmodels for cars and trucks. The second analysisuses the artificial neural networks (ANNs) to explore theprevious relationships. It is found that the ANN modelinggives the best prediction model. The most influential variableon V85 for cars is the radius of curve. Also, for V85 fortrucks, the most influential variable is the median width.Finally, the derived models have statistics within theacceptable regions and they are conceptually reasonable. 展开更多
关键词 Artificial neural networks Horizontal curve multi-lane highways Operating speed Prediction models Regression models Roadway factors
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Outlook of 2004 Chinese bus market
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作者 By WANG Yunyao Secretary general of China Highway Academy 《中国汽车(英文版)》 2004年第3期11-13,共3页
关键词 OUTLOOK highway sector PASSENGER RESTRUCTURING DECLINE PURCHASING expanding circumstances GROSS
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Ease On Down the Road
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《当代外语研究》 1994年第8期1-2,共2页
Slowly but surely, intelligent-vehicle highway systems are becoming available to more U.S. motorists. Next year, for example, a system called TrafficScope may provide real-time traffic information to motorists in seve... Slowly but surely, intelligent-vehicle highway systems are becoming available to more U.S. motorists. Next year, for example, a system called TrafficScope may provide real-time traffic information to motorists in several cities. 展开更多
关键词 BECOMING intelligent highway traffic REALLY themselves 红外线探测器 expand enabling UNIVERSITIES
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