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Often thought about something similar to that ie. having a weekend only tax rate for car use between say 6pm on Fri until 6am on Mon morning. Might encourage better public transport use if someone could keep a car for weekend use only too......
Would be a very easy change to make (just issue different colour and/or design tax discs) - the legislation is already there in that your car is either taxed or it's not for the applicable time of use.
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