The full impact of congestion on drivers’ commuting times has been revealed for the first time in an investigation by insurance specialist Admiral.

Drivers are losing an average of 10 days a year sitting in their cars during rush hour with journey times tripling on some routes.

Admiral compared the travel time of various routes into the centres of 13 major cities for a 9am arrival on a Monday, one of the busiest times to be driving, with 9am on a Sunday, when the roads are at their quietest. A central landmark in each city was given as the destination.

The figures reveal the full picture of congestion across the country, uncovering the shocking amount of hours drivers lose as they make their way to work. And this can mean more than just inconvenience – more bumps occur during rush hour than at any other time of day.

Unsurprisingly, London is the worst city for congestion, with commuters spending three times as much time in the car during rush hour, compared with the quieter day. That adds up to an average of 53 minutes more in the car for just one journey, which is a staggering 398 hours each year, or 17 days.

Manchester is the second most congested city in the UK – where drivers will spend an average of 45 extra minutes per journey in rush hour, compared to the same journey outside of peak times. This adds up to 335 hours, the equivalent of nearly 14 days every year.

Bristol comes third in the list, followed by Glasgow and Birmingham. Leeds is the city where congestion affects drivers the least – adding an average of 28 minutes on a journey but still doubling the time it takes for drivers to get to their destination.