Work is under way to improve journey times for motorists on a stretch of motorway in the south-east.
The M25 is notoriously one of the busiest sections of the road network, particularly between junctions 10 and 16.
Traffic is a big problem, especially at peak times, so the Department for Transport (DfT) has decided to take action to reduce congestion.
It is part of a £15 billion government plan to increase the capacity and condition of major roads in England.
The hope is to create 1,300 extra miles of lanes up until 2020 in what is the biggest upgrade to the road network in a generation.
All-lane running has already been introduced on two sections of the M25 - from junction 5 to 7 and junction 23 to 27 - maintaining safety on the motorway network while delivering more reliable journeys with less congestion.
Six strategic studies have been commissioned by the DfT to make further improvements that help the economy to grow between 2020 and 2025, of which t he work to improve the performance of the transport network between junctions 10 and 16 of the M25 is the last to begin.
The study is due to be completed by the end of the year, with a view to implementing any recommendations soon afterwards.
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