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This framework sets out how we, together with the Department for Transport, manage and deliver major road improvement projects.
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Frequently Asked Questions
Frequently Asked Questions
Q. What are the new cameras and signs for between junctions 28-27 of the M25?
A. The purpose of the project is to harmonise speeds during high usage periods to increase safety and maximising traffic flow.
Q. How many cameras and portable Variable Message Signs (VMS) have been used on this project?
A. The project consists of 6 Automatic Number Plate Recognition (ANPR) cameras located across 3 sites coupled to 5 portable VMS connected via a Journey Time Management System.
Q. What colour are the cameras?
A. All six cameras are painted yellow with grey cowlings and mounted on blue columns.
Q. How does slowing the traffic speed down make a journey more reliable?
A. Research on the M25 controlled motorway section (junctions 10 - 16) has demonstrated that reducing traffic speeds during high usage periods prevents stop-start conditions familiar to many drivers. The aim of the project between j28 and 27 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.
Q. Why are portable VMS used rather than fixed signs?
A. The decision to use portable VMS rather that fixed signs was made because of the long term proposal to widen this section of the motorway and introduce controlled motorway technology. When this occurs, the portable VMS signs and cameras can be redeployed where needed on the network.
Q. What is displayed on the portable VMS?
A. An advisory speed limit of 50mph together with flashing lanterns will be displayed, similar to those on other message signs you may see on the network.
Q. Is this only in the anti clockwise direction?
A. Yes this is only in the anti clockwise direction as it was identified as a section of motorway where this technology can provide significant benefits to journey time reliability.
Q. Will I get fined if I don't comply with the advisory speed limit?
A. No but your journey will be more reliable if you do comply.
