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M25 Junctions 28 - 27 Speed Harmonisation
M25 Junctions 28 - 27 Speed Harmonisation
- Status
- Current
- Located in
- Area 5
- Scheme type
- Other
The Project
The anticlockwise section of the M25, between junctions 28 and 27 has been identified as a section of road where congestion occurs on a regular basis.
Reducing traffic speeds during high usage periods prevents the stop-start conditions familiar to many drivers.
This innovative project based on the deployment of Automatic Number Plate Recognition (ANPR) cameras coupled with roadside portable Variable Message Signs (VMS) has been implemented on the M25 between junctions 28 and 27. This is the first time that existing Highways Agency type approved technology will be combined in this way.
The aim of the project between J28 and J27 is for the ANPR to detect increased traffic flows and then, through the Journey Time Management System (JTMS) set the advisory reduced speed limit of 50 mph. This will create a smoother traffic flow at reduced speeds which will increase safety and maximise traffic flow.
The ANPR cameras are used for gathering flow and journey time information. The information they capture is used to drive signals and is not for enforcement purposes.
Six ANPR cameras (located across 3 sites) monitor vehicle journey times on this section of the motorway. An automated JTMS analyses the journey time data. When the JTMS detects a congested motorway it will set an advisory 50mph speed limit on the five portable VMS located next to the hardshoulder.
Portable VMS have the added advantage of being able to display other messages aside from the advisory speed limit of 50mph together with flashing lanterns set by the JTMS, for instance if an incident occurs drivers can be informed of delays ahead.
