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If you have ever been to London it is no surprise that is the most gridlocked city in the U.K. However, a recent survey of traffic conditions revealed that London is the most gridlocked city in the world.

On average drivers spent 101-hours in gridlock traffic in the capital last year making it the first city to surpass the 100-hour mark.

The growth of the UK’s economy, the fall in unemployment and the rise in population could be inflammatory factors, the report suggested.

Bryan Mistele, president and CEO of INRIX, said: “London is the victim of its own success, with a robust jobs market and a growing economy attracting more people, more construction and consequently more traffic.”

“Transport for London is tackling this problem with its £4 billion Road Modernisation Plan. Whilst in the short term the roadworks from this initiative are frustrating for drivers, they are a step towards creating a more sustainable and modernised transport network.”

World’s most gridlocked cities

Below is the hour per year the average driver sits in traffic, based on study by traffic analyst INRIX for 2015.

London Most Gridlocked City

The report also revealed the UK’s most gridlocked cities with Manchester coming second. However, don’t worry if you are a motorist of Manchester as you spend around half the time stuck in traffic as Londoners.

UKs most gridlocked cities