In February 1996, the National Society for Clean
Air and Environmental Protection [NSCA]
published "Code of Practice for the Control of Noise from
Oval Motor Racing Circuits"; this document naturally it is
aimed at circuits used for meetings as opposed to private use.
Recommendations of The Code of Practice
In brief, the approach of the document is to limit the noise output of individual vehicles, to provide guidance on how environmental noise levels can be minimised and to recommend limitations on the hours of use. The document does not recommend suitable environmental noise levels; therefore the document does not say if the noise at the nearest house is above X dBA Leq,1hr then the noise is unacceptable, or anything similar. Some of the main points of the code of practice are:
The guidance on meeting times is set out above; however, the CoP also states "In noise sensitive areas, additional limitations may be appropriate. Evening background noise levels may be lower increasing the impact of noise from motor sport. Where events take place at this time of day careful consideration should be given to noise control."
For an existing circuit, the most relevant section of the CoP deals with noise control, is the information on "Physical Barriers Provided to Reduce Sound Propagation". It is stated that "The maximum practical sound reduction due to barriers is around 15 decibels (dB). Good screening should achieve about 10 dB reduction.