Abstract
Back of queue crashes on Interstates are a major concern for all state transportation departments. In 2020, Indiana DOT begin deploying queue warning trucks with message boards, flashers and digital alerts that could be transmitted to navigation systems such as Waze. This study reports on the deployment and impact evaluation of digital alerts on motorist’s assistance patrols and 19 Queue trucks in Indiana. The motorist assistance patrol evaluation is provided qualitatively. A novel analysis of queue warning trucks equipped with digital alerts was conducted during the months of May-July in 2021 using connected vehicle data. This new data set reports locations of anonymous hard-braking events from connected vehicles on the Interstate. Hard-braking events were tabulated for when queueing occurred with and without the presence of a queue warning truck. Approximately 370 hours of queueing with queue trucks present and 58 hours of queueing without queue trucks present were evaluated. Hard-braking events were found to decrease approximately 80% when queue warning trucks were used to alert motorists of impending queues.
Highlights
Identifying opportunities for continuous improvement in roadway safety is a priority for all transportation agencies
In 2020, Indiana DOT begin deploying queue warning trucks with message boards, flashers and digital alerts that could be transmitted to navigation systems such as Waze
This study reports on the deployment and impact evaluation of digital alerts on motorist’s assistance patrols and 19 Queue trucks in Indiana
Summary
Identifying opportunities for continuous improvement in roadway safety is a priority for all transportation agencies. Maintenance activities or ongoing work zone activities often result in slow traffic and/or forming queues. Several states are exploring or deploying queue warning trucks to provide visual alerts to drivers approaching stopped traffic on the interstate. Queue trucks are deployed ahead of the work zone on Indiana Interstates. Message board signs and flashers visually alert motorists of the slow-moving traffic ahead. They are equipped with digital alerts that could be transmitted to navigation systems. In-vehicle navigation alerts provide an additional opportunity to improve communication to drivers of modern vehicles
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