The third of five closures of the M25 between Junctions 10 and 11 (to the west of London) will take place from 9pm on Friday 12 July and 6am on Monday 15 July.
As with the previous closures this is expected to lead to a lot of delays and congestion on the diversion routes.
This is a big weekend for holidaymakers as well as coinciding with the Henley Royal Regatta among other events.
As for the previous closures pack your patience and follow the official diversion routes.