The most congested roads in the UK have been revealed – and they cost the economy almost £8 billion a year.
The worst offender was a stretch of the A406 North Circular in London between Chiswick Roundabout and Hanger Lane, where drivers spent two and a half days a year stuck in traffic.
Motorists on that road wasted 61 hours a year in a jam.
The second worst road was also in London, the A23 Brixton Road between Kennington and Thornton Road, where drivers lost 56 hours a year.
Third spot also went to the capital – drivers lost 49 hours on the Kingsway/Strand/Cannon Street stretch from Russell Square to Monument.
Transport data firm Inrix calculated that the average road user in London lost up to £1,680 (and 227 hours) due to jams.
This was followed by Belfast (£1,406 – 190 hours), Edinburgh (£1,219 – 165 hours), Manchester (£1,157 – 156 hours) and Leicester (£1,145 – 155 hours).
Liverpool had the lowest cost of congestion among the cities studied, at £878 per driver.
London and Edinburgh are the country’s slowest cities with an average speed for journeys into the central business district of just 7mph in peak time.
The Leeds Road/Saltaire Road from Harrogate Road to Bradford Road in Leeds cost drivers 44 hours per year.
In Birmingham, the A34 from Highfield Road to Highgate Middleway saw 44 hours per year wasted.
Congestion cost the UK an estimated £7.9 billion last year, at an average of £1,317 per driver.
Costs associated with slow-moving traffic include making it harder to transport goods, reduced productivity, raised pollution and increased accident levels.
The research found that London is the sixth most gridlocked city in the world when population is taken into account.
Moscow tops the list, ahead of Istanbul, Bogota and Mexico City.
Inrix transportation analyst Trevor Reed said: “Congestion costs Brits billions of pounds each year.
“Unaddressed, it will continue to have serious consequences for national and local economies, businesses and citizens in the years to come.
“In order to avoid traffic congestion becoming a further drain on our economy, it is increasingly obvious that authorities need to adapt.
“With the help of new and innovative intelligent transportation solutions, we can begin to tackle the mobility issues we face today.”
RAC spokesman Rod Dennis said: “Last year UK drivers told us that they are actually becoming more, not less reliant on using their cars – with struggling public transport cited as one of the reasons.
“This is a serious concern when you consider the limited physical space in our cities and the growing pressures to move large numbers of people around to get to their places of work and leisure.”