A new report says congestion on the M25 is so bad the region's economy is at risk and urgent action must be taken.
The report by Highways England found the stretch of motorway between the A3 in Surrey and the M40 in Buckinghamshire had the worst traffic in Europe with more than 220 thousands vehicles using it every single day.
In a highly controversial move it says key roads in Berkshire, Buckinghamshire, Surrey and Hampshire should be improved to cope with the growing problem.
This report is from our Transport Correspondent Mike Pearse.
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