About these metrics

All figures are derived from INRIX Signal Analytics: anonymized GPS pings from connected vehicles passing through signalized intersections, sampled across eight representative weeks of 2025. They are probe-based performance measures, not full traffic volumes. Full definitions, the data window, and Level of Service thresholds are documented on the methodology page.

Peak hours are rolling 60-minute windows stepped every 15 minutes. For each intersection we evaluate weekday AM, weekday PM, and weekend candidate windows separately and select the window with the highest average control delay as that intersection's peak. State composition aggregates those per-intersection peaks; the "typical" window cited in each caption is the modal window across states.