A21 Tonbridge to Pembury dualling

As part of the Highways England pilot scheme, Mobile VMS worked alongside Balfour Beatty on the A21 Tonbridge to Pembury providing improved journey time reliability, reduced congestion, greater network efficiency and improved driver information. Our mobile temporary Intelligent Transport Systems (ITS) provided live updates to motorists and the managing contractor on the road scheme.


Between the M25 and Tonbridge the original A21 was a 2 lane carriageway with grade separated junctions, limited access and no central reserve gaps. Between Tonbridge and Pembury the standard dropped to single carriageway with poor horizontal and vertical alignment and many individual accesses to properties, farm fields and woodlands. Approximately half way along the scheme there is a petrol station on the east side and junctions with two minor roads, Dislingbury Road and Pembury Walks, either side of the petrol station. This caused traffic congestion and delays on the A21, particularly due to right turning traffic. There were no footways and verges were either very narrow or non-existent. This single carriageway section of the A21 experiences severe congestion throughout the day and particularly at peak times and has a poor accident record with an average accident rate (expressed as accidents per million vehicle kilometres) about 20% higher than the default value for a road of this type.

The proposed dualling scheme was set to cause major disruption to an area already impacted by congestion. 


Using a series of mobile solar microwave sensors, Bluetooth sensors, mobile solar CCTV, mobile variable message signs and JamLogic real time traffic management software, Mobile VMS provided journey information to the motoring public through the A21 Tonbridge to Pembury, a 2.5 mile stretch of single land trunk road being upgraded to a dual carriageway. This alleviated congestion by smoothing traffic flow and improved both motorist and road worker safety by providing timely information to the motoring public and scheme project management team.   

Project Success

Simon Taylor Balfour BeattyA21 Pembury

“MVMS consulted closely with Balfour Beatty during the initial planning phase for Highways England’s orange scheme integration on the A21 Pembury Dualling. MVMS provided vital journey time and were the only company to offer an innovative advance queue warning (AQW) system providing real time information through the roadworks. They delivered all elements of the mobile ITS Integration, adhering closely to strict deadlines. They were responsible for deployment of all variable message signs, traffic sensors (Bluetooth, radar doppler) and their unique JamLogic traffic management software which provided a complete mobile intelligent traffic management system. The motorist was provided with accurate journey information through the roadworks and valuable queue warning information in advance of the works. This enabled Balfour as the roads contractor, to control traffic and speed through the work zone, facilitating more efficient safer roadworks. I would highly recommend MVMS as a temporary ITS provider.”

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