摘要: Three objectives were undertaken as part of this research. First, a literature review and national survey of growth factor estimation procedures was conducted. Of particular interest were the frequency, duration, and spatial densi... 展开 Three objectives were undertaken as part of this research. First, a literature review and national survey of growth factor estimation procedures was conducted. Of particular interest were the frequency, duration, and spatial density of counts collected to support the estimation of growth factors. It was determined that PENNDOT might improve their growth factor estimation program through the collection of traffic data at more locations for a shorter (than three weeks) duration. Second, historical PENNDOT traffic data were used to test the impact of reducing the duration of control counts from three weeks and to determine the benefits of including more locations. It was found that the three-week duration provided little if any benefit over 48-hour counts. In contrast, the additional locations improved the growth factor estimates. Finally, historical PENNDOT traffic data were used to cluster the existing permanent continuously operating automated traffic recorded (ATRs) according to monthly factors and other criteria. It was determined that the existing Traffic Pattern Groups developed by PENNDOT should be retained. 收起