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高速公路互通式立交约束型出口识别视距分析 被引量:15
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作者 沈强儒 赵一飞 +1 位作者 陈璋勇 曹慧 《中外公路》 北大核心 2012年第6期305-307,共3页
为确定高速互通式立交公路主线约束型出口的识别视距,运用汽车理论及人机工程学原理,分析了主线约束型出口不同设计速度对应的识别视距,提出了主线约束型出口满足不同主线设计速度对应的不同匝道设计速度的识别视距值。研究结果表明:对... 为确定高速互通式立交公路主线约束型出口的识别视距,运用汽车理论及人机工程学原理,分析了主线约束型出口不同设计速度对应的识别视距,提出了主线约束型出口满足不同主线设计速度对应的不同匝道设计速度的识别视距值。研究结果表明:对新建高速公路,出口位置所在主线线形应尽量避免采用识别视距临界值;对已建高速公路,当高速公路出口位置受地形地物限制,出口位于主线约束位置时,应加强高速公路约束型出口处安全保障措施,保证主线约束型出口交通安全。 展开更多
关键词 互通式立交 约束型出口 识别视距 安全 高速公路
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互通式立交间距约束型出口安全对策分析 被引量:1
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作者 沈强儒 毛建锋 曹慧 《山东交通科技》 2018年第5期102-104,112,共4页
从隧道出口驾驶员的"明适应"、驾驶员对立交出口位置的识别等方面进行了研究,提出了基于"明适应"的隧道与互通式立交出口需要的最小间距值,并结合变换车道需求,根据交通标志设置及交通条件确定两个立交之间的最小... 从隧道出口驾驶员的"明适应"、驾驶员对立交出口位置的识别等方面进行了研究,提出了基于"明适应"的隧道与互通式立交出口需要的最小间距值,并结合变换车道需求,根据交通标志设置及交通条件确定两个立交之间的最小间距值,并对间距约束型的立交出口问题提出安全对策。 展开更多
关键词 间距 约束型出口 安全 保障措施
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Institutional Constraints to the Competitiveness of the South African Citrus Exports
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作者 Portia Ndou and Ajuruchukwu Obi 《Journal of Agricultural Science and Technology(A)》 2013年第7期521-530,共10页
This paper examined the dual institutional constraints arising from the market liberalisation of the South African citrus industry and the stringent food safety health and private standards associated with the globali... This paper examined the dual institutional constraints arising from the market liberalisation of the South African citrus industry and the stringent food safety health and private standards associated with the globalisation of the agri-business industry. The aim of this paper was to explore the institutional challenges influencing the competitiveness of the South African citrus industry in the export markets. It also explored the implications of the institutional environment on market access. The logistic regression model was used to analyse the statistical data while simple ranking was used to indicate the new and emerging forces affecting the profitability of the industry in recent years. The results show that access to market information, economies of scale, compliance with strict food safety and quality standards, lack of proper infrastructure including transport and challenges of managing a business within the international business environment exerted significant effects on the competitiveness of the industry as well as the ability of domestic producers to enter the export markets. There is need for government intervention especially aligned to investing in infrastructure. Coupled with the support of private institutions, the government needs to support the exporters and producers in complying with private standards. 展开更多
关键词 Institutional constraints PERFORMANCE COMPETITIVENESS South African citrus industry export markets.
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