By Mieka Smiles A road expert has warned that the M25’s 57-hour closure this weekend could lead to the “worst traffic jam ever”. National Highways has decided to close the London ring road M25 for an unprecedented amount of time. Drivers are being told to avoid the five-mile stretch of the motorway in Surrey between junctions 10 and 11, as it will be closed in both directions from 9pm on Friday until 6am on Monday. This is the first time all lanes on the motorway have been scheduled for closure since it opened in 1986, with the main goal being to widen it by adding more lanes. However, a forme…