The Government has been urged to impose tougher rules so that people who throw rubbish out of their cars can be fined.
Councils who find litter being disposed from a vehicle can question the owner of the car and post a fine, but the local authority will find it difficult to prove their identity in court if the person denies the offence.
The Local Government Association (LGA) is calling on the Government to toughen up legislation in the Localism Bill, currently going through Parliament, which would see the owner of a car who is responsible littering offences face the same penalty for speeding or fly-tipping.
The LGA said that it costs councils £850 million a year to clean up the litter on Britain's streets, which motorists are contributing to by throwing cigarettes, empty bottles and fast food wrappers out of their vehicles.
Clyde Loakes, vice chairman of the LGA environment board, said: "Car litter louts who blight our countryside and cost council taxpayers millions in clean-up costs are getting away scot-free thanks to a legal loophole which could be easily closed."
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