Keep in the left lane unless overtaking sticker decal, rear of car

Keep in the left lane unless overtaking sticker decal, rear of car. Why not stick this on the rear of your vehicle to remind people on the motorway to keep left, If you are overtaking, you should return to the left lane when it is safe to do so (see also Rules 267 and 268).  East to apply and available in a range of colours. Size 5" X 3" approx