Traffic Analysis Toolbox Volume XII:
Work Zone Traffic Analysis – Applications and Decision Framework

Figure 56 Long Description

Figure 56. I-40 Case Study Work Zone Scenarios Travel Time Comparisons

Figure 56 summarizes the travel time results for each scenario based on field-observed or field-estimated values and FREEVAL model outputs before and after calibration. Before calibration, several of the model scenario results significantly differed from the field-observed travel times. The authors determined that the default Highway Capacity Manual 2010 work zone capacity estimates underestimated the resulting travel time on the facilities. The authors made adjustments to the default capacity adjustment factors (CAF) and generated new model travel times results. The after calibration model travel times appeared to be more closely matched to field-observed results.