The next slowest is the M4, another motorway notorious for delays.
Data was taken from more than 3,345,025 vehicles that had been analysed using SATRAK tracking software from January 1, 2016 to December 31, 2016.
The data covers Britain's entire 2,173 miles of motorway network.
The traffic in Ely travels at the same pace as the country's capital, London, travelling at an average speed of just 14.59mph.
The 242-mile stretch of motorway - 120 miles clockwise and 122 miles anti-clockwise - beat key routes such as the M3 and M4 to the title, with an average speed of 25.05mph.
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"That said, however, there have been some improvements in the past five years so hopefully these will continue to make life a little easier for those that travel on it on a daily basis".
A new report by vehicle tracking company Satrak has revealed the slowest motorways in Britain. We undertake work throughout the country and usually find the M25 to be the most cumbersome, and our data provides evidence for that.
The Managing Director of Satrak, Dan Walton, said: "It's little surprise to find that the M25 is in fact the slowest motorway".
Surprisingly, the report also concluded that Cambridge, not London, has the slowest city traffic in the United Kingdom with drivers in the old university city reaching an average speed of just 13.73mph.
Although one of the most important motorways in the United Kingdom, the M25 has been highlighted as the slowest motorway in Britain with speeds averaging at just 25 miles per hour.
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