What happens if you are disabled, are you still expected to get out of the car?
i suppose it would depend if you were on sticks or wheel chair bound.
I'm a disabled driver, and when I've been pulled over I will always wait till them come over to me. They pulled me I didn't ask them !!.
And if it's raining why would I want to get wet

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As has been said before, open your window just enough to hear them, and if they are plain-clothes and in a unmarked car, you've every right to ask to see their warrent card up close to see their number and name.
And if in any doubt make a note of the cars Reg number, and till them your phoing the Police now to confirm who they are ?. If their not genuine they'll be the one's probably doing a runner !!.
Again as said before, you could always have a A4 size paper in large text saying something on it like; Please show me your badge, and I'll phone the Police to confirm your a genuine officer. Only then will I continue this conversation if you are.
Oh and if you think that a marked car or uniformed officer looks suspect, you still have the right to ask them for identification as well.
Will we need to keep a look out for you on Police Camera Stop, or Police interceptors in the future then ??!!

- Just joking.
