[color=#000000][font=Verdana, Verdana, sans-serif][size=3]It's the sound level the bin lid makes when dropped shut from an angle of 90 degrees.[/size][/font][/color]
[color=#000000][font=Verdana, Verdana, sans-serif][size=3]It's covered by an EU directive (what isn't?) and designed to minimise noise disruption for early morning collections.[/size][/font][/color]
[color=#000000][font=Verdana, Verdana, sans-serif][size=3]The bins are designed in such a way that when the lid falls, it creates a cushion of air just before it shuts, minimising the noise though this rarely works.[/size][/font][/color]