UK A Blackwall Tunnel tidal flow stopped   As per the header the tidal flow has been stopped in that east London England tunnel I removed the entry from the article as there is no section for defunct counter flow systems The original entry is as follows   The A Blackwall Tunnel   x  lane tunnels in the morning  lanes used for northbound towards the city centre traffic  lane for southbound traffic in the evening  lanes are provided in both directions This counterflow system was permanently stopped on  April  with reasons given as increased dangereous driver behavior   See Blackwall Tunnel article for citations and references