New bright orange emergency areas are being trialled on the M25 to improve visibility so they are more obvious on smart motorways.
It is also hoped that it will encourage drivers to only use them in emergency situations.
The first of the new emergency areas went live on the M3 near Camberley in Surrey last month. This change is part of a review into the design and spacing of emergency areas on smart motorways.
The first orange emergency area on the M25 is on the anti-clockwise side, between junctions 25 (Waltham Cross) and 24 (Potters Bar).
The remaining 22 emergency areas on the M25 will have the distinctive orange colour added between junctions 23 (Hatfield) to 27 (for the M11) and junctions 5 (interchange with M26) and 7 (for the M23) if the trial is successful.
Highways England chief executive Jim O’Sullivan said: “We recognise the public concern about smart motorways and we also believe that changes such as these will help drivers have confidence when using them and be clear about where they can stop in an emergency.
“That is why we are trialling these highly visible new style emergency areas. The bright orange colouring will make them as easy as possible to spot and should also discourage drivers from using them in non-emergency situations.”