Wiltshire Council also agreed to allow it to add 700 free parking spaces.

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While no other major airport offers such a generous incentive, several cities offer free parking for electric cars in metered spaces.

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SpotHero, which helps Chicago commuters reserve parking spaces, has had rent-free desks for over a year.

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Some traders have said the parking fees could put off shoppers, although others believe it could free up spaces, as some people leave their cars along these roads all day.

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