Comparison of interior and exterior acoustics. The left panel shows the change of median loudness ΔL_N50 for the interior vs. the peak loudness outdoors (L_N5, 7.5 m). Orange denotes the passenger car, blue the truck and grey shows data from the first interior measurement. The right panel shows the predicted urgency as a function of predicted annoyance (using data from 25 m). Error bars show 95% confidence intervals.