This is the best summary I could come up with:

The camera records an image of the vehicle and its noise level, creating evidence that can be used by police to issue fines.

RAC head of policy Simon Williams said: "Our research with drivers shows there is a very strong desire to put an end to the scourge of excessively noisy vehicles that disturb the peace all around the country.

"It's plain wrong that those who have fitted their cars with modified exhausts, some motorbike riders and supercar owners can currently just get away with making an unacceptable amount of noise.

"There is no good reason why cars and motorbikes should make so much noise, so the sooner effective camera enforcement can be put in place the better."

Roads minister Richard Holden said: "Boy racers are an anti-social menace and we have extensively trialled noise camera technology in various parts of the country over the past year.

"We are currently analysing data from the trials and will update in due course on any future measures which will help bring peace and tranquillity back to our towns, cities and villages."

I'm a bot and I'm open source!