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Work zone mobility is a key focus area for VDOT’s performance measurement program. VDOT used probe-based performance measures to estimate related delays at State, district, corridor, and project levels. Probe vehicle data from different sources are used to identify macro-level (e.g., corridor-specific) and micro-level (e.g., project-specific) contributions to delay, as well as their underlying issues and root causes, and areas of opportunity for improvement. By measuring work zone mobility performance, VDOT is not only able to report performance on an annual basis but also analyze trends and patterns over time. Furthermore, by segmenting and aggregating performance measures at the individual-project level and the macro-levels, VDOT gains a comprehensive bottom-up and top-down view of work zone performance. VDOT’s work zone and traffic control practitioners use the intelligence gained from these efforts to improve project-level work zone management practices and broader agency, district, and corridor-level work zone policies and procedures.

VDOT uses commercial probe vehicle speed and travel time data at three different levels of granularity (with segment lengths of 0.16, 0.42, and 1.16 miles) as the key data for quantifying work zone mobility performance. Additional data, such as traffic volume counts, Bluetooth and WiFi travel time data, incident, work zone activity, road condition and weather data from Traffic Operation Centers, and vehicle hours of delay data from the Regional Integrated Transportation Information System are also used. These data provide additional contextual data to help understand the dynamics and causal relationships of work zone performance.

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Federal Highway Administration
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Utilizing Probe-Vehicle Data for Work Zone Mobility Performance Measurement
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