Effective Area Parameters

This data-set contains the measured readings of all the parameters required for estimation of effective area which, further, can be used for estimation of vehicle equivalency factors. Vehicle equivalency factors are required to convert a heterogeneous traffic stream, such as in developing countries like India (urban areas), into an equivalent homogeneous traffic stream to calculate roadway capacity and plot speed-flow relations. Furthermore, this data was acquired with the help of SEV software (as described in Minh et al. 2005); videography method was adopted to record video of the selected road sections, which was analysed in the SEV software. It must be noted that the selected sites were in Ahmedabad city of Gujarat state in India; however, the accuracy of the final equivalency factors can be increased with addition of more samples. (An illustrative figure is also provided to derive an idea as to how this data-set can be interpreted to calculate effective area.)本数据集包含有效面积（effective area）估算所需的全部参数实测值，而有效面积可进一步用于车辆换算系数（vehicle equivalency factors）的计算。车辆换算系数可将异质交通流（如印度等发展中国家城市区域的交通流）转换为等效均质交通流，用于道路通行能力计算及速度-流量关系曲线绘制。此外，本数据集的数据采集依托SEV软件完成（具体方法详见Minh等人2005年的研究）：采用视频录制法记录选定路段的视频影像，并通过SEV软件对影像进行分析处理。需特别说明的是，本次选定的研究路段位于印度古吉拉特邦艾哈迈达巴德市；不过，通过增补更多样本可进一步提升最终车辆换算系数的计算精度。本数据集还附带一张说明示意图，以便用户理解如何解读本数据集以开展有效面积计算工作。