SSL success with Dartford Safety Cell 

SSL was subcontracted to design, develop and install a new traffic system that identifies vehicles posing a safety risk, prior to entering the Dartford Crossing. Following extensive prototyping and testing at a disused airfield, the system was installed and commissioned on schedule and went live on 14th June 2015.

The system identifies oversized lorries and hazardous loads travelling northbound from Kent into Essex and triggers a series of traffic signals and barriers which directs them into a separate lane where they will be met by an escort and taken through the tunnel.

Drivers who fail to follow the new signs and use the correct lanes could receive fines or points on their licence.


The new system is part of the Dart Charge scheme where crossing tolls are paid online.Previously, unsuitable vehicles were identified by staff at toll booths, which have now been replaced with the free-flow charging system.

Dart Charge project director Nigel Gray said:

"This new safety system is vital for the safe operation of the tunnels and will enable us to remove the old payment barriers for good," he said.