The 1.8-kilometre-long tunnel is the longest non-estuarial tunnel in the UK. This tunnel project was a part of the improvement of Highway A3 between London and Portsmouth in Surrey.
It is equipped with advanced safety systems such as; radar-based incident detection system, 104 CCTV cameras, communication systems, intelligent LED-lighting and high-quality ventilation. Every 100 metres there is a cross-passage and easily identifiable escape routes.
