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Evaluation of Work Zone Mobility by Utilizing Naturalistic Driving Study Data, Phase II

The objective of the second phase of this research is to evaluate the work zone mobility by studying complete Naturalistic Driving Study (NDS) work zone trip data. The NDS data provide a unique opportunity to study car-following models for different driver types in different work zone configurations. The time series data, forward view, and radar data from NDS can provide variables such as speed, acceleration rates, gas and brake pedal status at 0.1-second intervals, driver’s vision, and headways in seconds. In this study, first, the headway selection tables for different driver types (gender, age group, risk perception, etc.) at three work zones (lane closure (LC) 2-1, shoulder closure (SC) 2-2, and 3-3) and all level of service (LOS) will be developed. Second, the headway distributions before, during, and after work zone areas (500 ft upstream, advanced warning area, transition area, activity area, termination area, and 500 ft downstream) will be compared. Next, the speed-flow density relationships of different work zone configurations will be identified by applying the fundamental traffic flow theory, and work zone capacity method in the Highway Capacity Manual (HCM). The results of this study will be applied to calibrate and improve work zone related planning and simulation tools.