The state got almost €30 million in motor tax from Shannonside drivers last year.
Drivers paid just under €7 million in Leitrim, €8.2 million in Longford, and €14.6 million in Roscommon.
Each of these figures are around €200,000 or €300,000 higher than the previous year.
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A total of €964 million was collected in motor tax around the country last year.