Well for a start I should have said illegal ?
I can't find the old wording for this, new in brackets.
3.12.7 No bodywork (which is visible from beneath the car and which lies between the rear wheel centre line and a point 350mm rearward of it may be more than 175mm) above the reference plane. Any intersection of the surfaces in this area with a lateral or longitudinal vertical plane should form one continuous line which is visible from beneath the car. (A single break in the surface is permitted solely to allow the minimum required access for the device referred to in Article 5.15.) Additionally, any bodywork in this area must produce uniform, solid, hard, continuous, rigid (no degree of freedom in relation to the body/chassis unit), impervious surfaces under all circumstances.
Old wording
3.8.1 Other than the rear view mirrors, each with a maximum area in plan view of 12000mm�, no bodywork situated more than 330mm behind the front wheel centre line and more than 330mm forward of the rear wheel centre line, which is more than 600mm above the reference plane, may be more than 300mm from the centre line of the car.
New wording
3.8.1 Other than the rear view mirrors (including their mountings), each with a maximum area of 12000mm� and 14000 mm2 when viewed from directly above or directly from the side respectively, no bodywork situated more than 330mm behind the front wheel centre line and more than 330mm forward of the rear wheel centre line, which is more than 600mm above the reference plane, may be more than 300mm from the centre line of the car."
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