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      01-12-2013, 02:01 PM   #8
Billyray911
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Drives: 335d
Join Date: Dec 2009
Location: Mind your own business...no,really.

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As Mart has mentioned,its a judgement call for a variety of reasons/merits.
On a motorway,general rule of thumb (good practice) is that everything goes on after a certain speed,as you are expecting too much of m.o.p.
If things go wrong,the occupants of the Police vehicle can massively drop in it...but that's another discussion.
The whistling is the air passing the roof bars btw.