there was a Guinness record update in July 2019
a powerpoint is here
there are some links (in 'hidden' slides) to youtube clips
there's some difference of opinion about whether it is sinA or tanA (where A is the angle of inclination) that is used as a gradient (slope) measure but it seems (appropriately) to be the tangent of the angle: the elevation distance / horizontal distance
Guinness World Records sets out a definition for the steepest street: the maximum gradient over a ten metre span, comparing the vertical rise to the horizontal distance
see the wikipedia entry on grade(slopes) here
the quoted slope on road signs appears to be the steepest section of the road rather than an average slope over the length of it
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