A scheduled upgrade to the safety control systems in the Dartford tunnels required a full power down, rendering the tunnels out-of-action overnight.

CPS had to devise a way to keep traffic flowing in both directions.

The QEII Bridge, which carries southbound traffic from Essex into Kent is a four-lane carriageway.

Crossover points allow traffic to be diverted between north- and southbound carriageways in emergency situations.

A contraflow arrangement across the bridge, with a lane running in each direction, would keep all traffic flowing.

Planning for the contraflow began in early 2017.

CPS worked with Highways England and its traffic officer service to develop the original closure devised for the 2012 Olympics emergency response plan, but never used.

CPS’ onsite incident support units, maintenance and recovery teams removed Vehicle Restraint Systems and remained in strategic lay-up points.

Deployment took around 2 hours, with traffic management lifted in less than 90 minutes.

This was the first-ever deployment of a contraflow across the QEII Bridge.

Traffic flow remained steady, with minimal delay, in both directions.

CPS has a plan for use in the future, both for emergency situations and planned maintenance.




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