British acoustic consultancy LF Acoustics measured the sound insulation of a typical modern touring caravan with double glazing, finding a 22 dB difference between outside and inside noise levels. German calculations for a campsite in Neustadt in Holstein estimated about 25 dB for the outer panels of a modern motorhome with closed windows. Sound insulation works in both directions but does not guarantee complete silence for neighbors, especially with open windows or roof hatches.