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There was DfT guidance on these, but for the life of me can’t find it (probably IAN 3/81). It may have been removed in 2016 when they became prescribed, or the DMRB was overhauled.

This ( ) from Cheshire pulls out the key bits though in section 1.4 – I use these criteria whenever we get the odd request, even if it isn’t formally documented in policy (yet).

Andy, grateful for a pdf copy of 3/81 if you still have it handy.