Evaluating Impact of Automated Work Site Speed Enforcement Using Connected Vehicle Data

This study evaluates the effectiveness of Speed Safety Camera (SSC) deployments in reducing traffic speeds through four interstate work zones in Indiana in accordance with Indiana State Law House Enrolled Act (HEA) 1015. The initial deployment of SSC was along the interstate I-70 in August 2024, with deployments on I-69, I-465, and I-65 subsequently following in 2025. To evaluate the impact of SSC deployments in Indiana, connected passenger car and connected truck data were used to quantify the change in speed characteristics before and during the SSC deployments. Approximately 100 million passenger vehicle records and 3 million commercial truck records were analyzed. That Connected Vehicle data was used to count the number of spot speeds, at 0.1-mile intervals, that were 11 mph or more over the work zone speed limit over the entire work zone. The length of those study segments ranged from 3 to 10 miles. Across 443 SSC deployment days between 14 August 2024 and 11 July 2025, the study found 34% reductions on average in the percentage of passenger vehicle spot speeds exceeding the work zone speed limit by 11 mph or more on weekdays between 6 AM and 6 PM. For commercial trucks, there was a 41% reduction across the study sites.