This confusion arises from the fact that we mix two measurement standards - the imperial (feet; acres) and the metric (metres; hectares).
Kenyan surveyors do their work in the metric standard. This is why you title deed will indicate the size in hectares (ha). The so-called eighth of an acre is actually surveyed as 15m by 30m. This makes it exactly 0.045ha.
If you convert this to feet, you will get 49ft, 2.55in by 98ft,5.1in.
Clearly, '50x100' is an approximation - actually an over approximation!
Regarding access roads, I thought the minimum width is 9m; not 6m...
Nothing is real unless it can be named; nothing has value unless it can be sold; money is worthless unless you spend it.