Out and about today looking for UCR's and came across this sign, does anyone know what type of access it refers to

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Good few routes, but very slippy

running at road pressures on wet chalk, but where thye rain was running down, it had cleaned a foot wide path up

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View from the top

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The routes were marked as '' Other routes with public access'' on the map and '' Other road,drive or track, with no other signage at either end apart from the ones in the pictures.
Off the beaten track!.