Tunnelcategorieën Groot Brittannië Tunnel Categorie Verbinding Weg 1 Dartford C London: Dartford – Thurrock A 282 2 Mersey D Liverpool - Birkenhead 3 Clyde D Glasgow: Govan – Whiteinch 4 Ramsgate A Ramsgate A 229 5 Limehouse E East London: limehouse A 1203 6 Rotherhithe E East London: Limehouse – Rotherhithe A 101 7 Blackwall E London Borough of Tower Hamlets – London Borough of Greenwich A 102 8 East India Dock Road E London: city – East A 13 9 Tyne D Jarrow – North Shields and Howdon A 19 10 Heathrow Airport Road tunnel 4.00-23.00: E 23.00-4.00: C M4 – airport terminal 1, 2, 3 M4