Hertfordshire has spent the most on 20mph speed limits in the last three years, with the council spending £4.6million.
This was closely followed by Oxfordshire (£3,029,200), Cornwall (£2,664,026), Neath Port Talbot (£2,126,000) and Aberdeenshire (£2,107,654).
Matt Crole-Rees, motoring expert at Confused.com car insurance, which commissioned the research, emphasised how 20mph speed limits have “reshaped Britain’s roads”.
He continued, saying: “Behind every one of those speed limit changes is a road safety issue.