National Highways: South-East retweeted: Traffic stopped #M25 clockwise between J21A to J22 near #Watford due to a @HertsPolice incident. We’ll keep you updated. Post navigation Update: All lanes are now open on the #M25 clockwise between J10 (#Kingston to J11 (#Chertsey) following an earlier collision. There are 2.4 miles of congestion following this incident so please allow time for delays to clear. National Highways: South-East retweeted: Traffic released in all lanes #M25 clockwise between J21A to J22 near #Watford following a brief hold on traffic. Traffic flowing freely with no delays.