London's roads would need a £686 million revamp taking 10 years to bring them all up to standard, according to a survey.
It adds that nearly one in six of the capital's roads are in such poor condition, they have five or less years of usage remaining.
The number of potholes filled in by London boroughs this year was also down 45% from last year, and is at the lowest level since at least 2011/12.
In total, 72,544 potholes were filled in 2016/17 in London, an average of one every seven minutes and 15 seconds.
The boroughs filled an average of 2,267 potholes each, down from 4,099 the year before.
The data comes from the latest results of the Annual Local Authority Road Maintenance (ALARM) survey, produced by the Asphalt Industry Alliance (AIA).
The survey asked London borough councils to estimate how much it would cost to bring their road networks up to scratch, in a one-off project, assuming the resources were in place to make it practical.
Based on their responses, it was estimated London would need £686.1m, or an average of £21.4m for each borough, to clear the backlog, although that is down from £22.1m the year before.
If the funding and resources were in place to get roads back into a reasonable condition, highway departments reported that the estimated amount of time required to carry out such work would be around 10 years, down from 16.
The survey found that 16% of London's roads were in 'poor structural condition' in 2016/17, with less than five years of life remaining. This is up from 12% in 2015/16 but down from 17% in 2014/15.
Councils across London said they paid out £640,400 compensation to road users due to poor road conditions, with the average number of claims per council in London rising from 32 to 34 in a year.
Local authorities responded to the results of the survey by highlighting that 45% of their network is in good structural condition (defined as having 15 years or more residual life), compared with 42% in 2015/16.
The average budget shortfall - the difference between the annual budget that highway departments calculate they require to keep the carriageway in reasonable order and the actual budget they receive - per council was £2.5m.
London's 9,194-mile road network is resurfaced the most frequently compared to the rest of England and Wales, with an average time between resurfacing on principal roads of 17 years on average, and non-principal roads, 25 years.
Across London, 53% of councils reported unforeseen road maintenance costs, averaging an extra £272,000 per council, up from 31% the year before.
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