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Analysis of Work Zone Traffic Behavior for Planning Applications

机译：规划应用中工作区交通行为分析

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摘要

Understanding work zone traffic behavior is important for the planning and operation of work zones. The objective of this paper is to develop a mathematical model of work zone traffic flow elements by analyzing the relationships between speed, flow, and density that can be used to estimate the capacity of work zones. Traffic flow data were collected from 22 work zone sites on South Carolina interstate highways. The scatter plots of the collected data demonstrate that the relationship between speed and density does not follow Greenshields' linear model. A non-linear hyperbolic model was developed to describe the relationship between speed and density. Using this model the capacity of a work zone was estimated to be 1550 passenger cars per hour for 2-lane to 1-lane closures. Adjustments to this capacity value to consider other types of vehicle as well as the work zone intensity are provided. Highway agencies can use this estimated capacity along with anticipated traffic demand to schedule work zone operations to avoid long periods of over-saturation. The tapered approach to work zone lane closures used by South Carolina is similar to methods used in work zones throughout the world. The authors believe that the methodology described in this paper for modeling work zone traffic as well as estimating work zone capacity is transferable to other countries. The conversion of actual volumes to passenger car equivalents may have to be modified due to the significant differences in traffic makeup between the United States and other countries.
机译：了解工作区的交通行为对于工作区的规划和操作很重要。本文的目的是通过分析速度，流量和密度之间的关系来建立工作区交通流要素的数学模型，该模型可用于估算工作区的容量。从南卡罗来纳州州际公路上的22个工作区站点收集了交通流量数据。收集到的数据的散点图表明，速度和密度之间的关系不遵循Greenshields的线性模型。建立了非线性双曲模型来描述速度和密度之间的关系。使用此模型，工作区的容量估计为每小时2到1道封闭的1550辆乘用车。提供对该容量值的调整以考虑其他类型的车辆以及工作区强度。公路部门可以使用此估计的容量以及预期的交通需求来安排工作区运营，以避免长时间的过饱和。南卡罗来纳州使用的渐渐封闭工作区车道的方法与全世界工作区使用的方法相似。作者认为，本文描述的用于对工作区交通进行建模以及估算工作区容量的方法可以转移到其他国家。由于美国与其他国家/地区之间交通流量的显着差异，因此可能需要修改实际流量到当量轿车的换算。

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