Junction works deliver 'more intuitive layout'

03/12/2021
Chris Ames

National Highways, its contractors and their workers have now completed a scheme to improve journey times on England’s largest gyratory roundabout.

Junction 23 on the M25 in Hertfordshire (pictured) connects the M25 with the A1(M) for Hatfield at South Mimms.

According to National Highways, it is the biggest gyratory on its network at around 1.2km in circumference and sees some of the highest traffic flows on London’s orbital motorway.

The £7.5m upgrade at the junction has involved the widening of the southbound A1 entry slip road to provide a two-lane entry onto the southbound A1.

The upgrade also sees a new footway for pedestrians from the BP service station to the existing footway.

National Highways said the upgrade has made the junction safer and easier for drivers and also includes an upgrade of the traffic signal timings to improve flow through the junction.

It said a new lane at the Bignells Corner exit from South Mimms services, with a widening of the M25 westbound exit slip road to accommodate an additional lane, has made the layout more intuitive as drivers approach the junction.

This has created a more free-flowing network in the area around the junction, which National Highways said will help accommodate local traffic and improving safety for users.

National Highway’s regional director in the South East, Nicola Bell, said: ‘These improvements have already added vital extra capacity and improved journey times for road users.’

Connect Plus chief executive Andy Dean said: ‘We are delighted to support National Highways in the successful delivery of the M25 junction improvement scheme at Junction 23. The project’s success is a testament to the skills and collaborative working relationship between National Highways, Connect Plus, Connect Plus Services, Jackson and our supply chain.

‘To complete works amidst a global pandemic has presented a number of challenges which our teams have tackled with great determination. We cannot thank them enough for all that’s been accomplished and for the positive impact their efforts will bring to our customers using the strategic road network.’

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