Visibility from the driver's seat

What the rule requiresWhere it goes wrong
MirrorsCars first used after 25 January 2010: left and right exterior mirrors and an interior mirror. If the interior mirror shows nothing useful — a van without a rear window — it is not required (paragraph 2).Thinking three mirrors are always required. The date of first use decides, and the interior mirror has an exception.
Windscreen wipersA properly working wiper installation giving the driver SUFFICIENT VIEW. At inspection one working setting suffices, the intermittent one excluded.Looking at the wipers instead of the result. The requirement is not “they move” but “they give sufficient view” — a worn blade fails.
Windscreen washerRequired for cars first used after 30 September 1971. A separate requirement alongside the wipers, not the same thing.Driving with an empty washer bottle. Without water the wiper makes the screen blinder — exactly the situation where you can no longer see.
Demisting and defrostingCars first used after 30 September 1971 must have a working installation for DEFROSTING and DEMISTING the windscreen. Two functions in one requirement.Driving with a small hole cleared in the ice or mist. The requirement covers the whole windscreen; a peephole is not vision.
Windscreen and side windowsThe windscreen and the side windows BESIDE THE DRIVER'S SEAT may show no damage or discolouration. The rear windows fall outside this requirement.Thinking a stone chip “somewhere in the glass” is always acceptable. In the driver's field of view the strictest rules of annex VIII apply.

The law itself

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