Traffic congestion cost the UK economy an estimated £9bn according to Inrix, which as revealed the worst jams over the past 12 months.

UK’s worst traffic jams revealed

The year’s worst traffic jam occurred on 4 August 2017 on the M5 Northbound by Junction 20. Traffic tailed back 35 miles at the peak, and the jam lasted 15 hours, resulting in an estimated cost of £2.4m to road users.

This was followed by an incident on the M6 on 7 April, which saw drivers delayed for up to eight years as a result of emergency services, costing £1.2m overall.

Overall, November 2016 was the worst month in terms of volume with over 169,000 traffic jams on the UK’s major roads – 50% worse than average. However, traffic jams across the month of April proved the most severe, with the research revealing they were 24% worse than average.