Commuters in Rome lose 42 minutes to traffic jams every day - or more than six full days over the course of the year.
But the capital isn't the worst city in the country when it comes to time lost to congestion.
That title goes to Palermo, where traffic increased the average journey time by 43 percent, three points more than the eternal city. This makes it the sixth most congested city in Europe, beating London and Paris.
However, when it comes to the morning rush hour, Rome is the worst place in Italy to be behind the wheel, with a 'congestion index' of 74 percent at peak times.
The figures come from the TomTom Index 2017 which measures congestion around the world.
After Palermo and Rome, Messina was the next most congested city in Italy, with Naples and new entry Reggio Calabria rounding out the top five.
Next came Milan, Catania, Taranto, Bari and Florence.
At the other end of the scale, Parma and Brescia in the north of the country are the best places for drivers, with journeys only extended by an average of 15 percent. Even here, though, that figure had increased by two percent compared to last year ´- in fact, congestion has increased in every city in Italy.
The study measured traffic levels in 390 cities in 48 countries worldwide, with Mexico City emerging as the traffic jam champion, followed by Bangkok and Jakarta.
In Europe, the Polish city Łódź came out on top, with Bucharest and Moscow in second and third place.