Derry City and Strabane council say a recent hike in city centre car parking prices was needed for "critical frontline services".
Prices at all council owned 'pay and display' carparks increased across the city and district by 20p per hour earlier this week, prompting outcry from some city-centre workers in Derry.
One city-centre worker told Belfast Live his parking costs had almost doubled "overnight" when the new rules came into effect.
