Highways England says that it is a heavily used junction with a roundabout mainly controlled by traffic lights. It is already operating at full capacity – up to 7,500 vehicles per hour currently travel through the roundabout at peak times – with traffic queues and lengthy delays.
The junction 28 scheme involves the construction of four new bridges and, if approved, is expected to take two years to complete once site work begins.
Under the regional frameworks announced by Highways England in November 2018, contractor John Graham was allocated the improvement schemes to both junctions 25 (A10) and 28 (A12) of the M25. Graham is working with consulting engineers Sweco and Fairhurst.