@DttDtht13 Hi, the tunnels are often closed for routine inspection and maintenance work. (1/2) Post navigation National Highways: South-East retweeted: Lane 4 (of 4) is closed on the #M25 clockwise between J16 #Uxbridge and J17 #MillEnd due to a road traffic collision. There are delays of approximately 30 minutes above normal journey times on the approach to the incident. @DttDtht13 (2/2) More info: nationalhighways.co.uk/our-work/south….