Britain's motorways are so congested the average speed of drivers is just 25MPH ...

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Revealed: Britain's motorways are so congested the average speed of drivers is just 25MPH in some areas The slowest sections are two stretches of the M25 leading to Dartford Tunnel Second slowest is a northbound stretch of M5 at junction 2 near Birmingham Findings emerged from an analysis of the Department for Transport figures

By Tom Payne Transport Correspondent For The Daily Mail

Published: 00:13 GMT, 9 November 2019 | Updated: 01:45 GMT, 9 November 2019

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Britain's motorways are so congested that the average speed is only 25mph in some areas, official figures reveal.

The slowest sections are two stretches of the M25 leading to the Dartford Tunnel.

Next slowest is a northbound stretch of the M5 at junction 2, near Birmingham, where drivers endure average speeds of 26.7mph.

The slowest sections are two stretches of the M25 leading to the Dartford Tunnel (pictured)

The slowest sections are two stretches of the M25 leading to the Dartford Tunnel (pictured) 

The findings emerged from an analysis of Department for Transport (DfT) congestion figures in 2018. 

The average speed is calculated by DfT experts taking speed observations from a sample of cars across 24-hour periods throughout the year.

They work out an average over an entire day, which means some speeds during the rush hours will be even slower.

Where the slowest average speeds in the country are

Where the slowest average speeds in the country are 

In all, there are 17 stretches of motorway where average speeds are below 30mph. The start of the M4 heading west out of London at Chiswick has three separate stretches in the top ten worst sections in the country.

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