Vehicle noise analysis — 2026 recording season (April–June) · Vehicles = human-labeled vehicle or model prediction ≥70% confidence
Event count per local hour (Oslo, CEST). Shaded area = sleep window 19:00–07:00.
Vehicle events ≥75 dB(A) during the sleep window (19:00–07:00) per day. Line = 7-day trailing average. This is the proposed metric that Lden cannot capture.
Each dot = one vehicle event. Y axis = peak level lmax dB(A). ● sleep window 19:00–07:00 ● daytime 07:00–19:00. Horizontal lines at 85, 90, 95 dB(A). Dots are jittered horizontally within each day bucket to show density.
Peak level (lmax) histogram for vehicles split by time of day. The distributions overlap almost entirely — nighttime vehicles are just as loud.
Human-labeled aggressive events (modified/free exhaust) by local hour and vehicle type. Shaded area = sleep window.