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One of the nuggets I took away from my course were the stats to the question; "Where do most road deaths occur"? a) on the motorway [70 MPH motorway] b) suburban [50-60 MPH countryside] c) urban [30-40 MPH built up areas] I thought that the "speed kills" theory would mean the motorway - WRONG...

And tyre wear too. A new tyre may have around 12mm of tread, but could wear down to 2mm and still be legal - that's 2cm off the diameter of the tyre. Some maths required to calculate the difference but essentially, the worn tyre will be spinning faster than the new one for any given fixed...