Noise map of Great Britain

The Telegraph (a center-right newspaper in the UK) has published a noise map of Great Britain that was compiled from traffic noise levels by Deepak Prasher, professor of audiology at University College London. I can not recall ever seeing such a map, but it is fascinating to not only note the absolute levels on particular places (especially the sites where you need ear plugs to get a good night's sleep) but also to compare different areas.