A crash on the M25 this evening has caused severe delays near Potters Bar and the A1(M).

https://twitter.com/HighwaysEAST/status/940998932662046721

The collision clockwise between Junction 25 and 26 has caused two lanes to close, with long tailbacks to Junction 24 for Potters Bar and 23 for the A1(M) and South Mimms.

Highways England has warned motorists to plan ahead before using the stretch and avoid it if possible.