mainly highways which do not connect to other highways, for a number of reasons , including:
a) the 1st highway has been connected to a landarea which shares the same position as the 2nd highway.

b) the 1st highway has been connected to a landarea which is very close to the position of the 2nd highway.

c) the 2 highways to be joined have nodes which are in the same position, but are not the same node, so routing is impossible

d) rather than joining highway 1 to highway 2, the end of highway 1 is very close to, but not connected to highway 2.

these problems are identifiable on the routing layer of OSM Inspector

mainly highways which do not connect to other highways, for a number of reasons , including:
a) the 1st highway has been connected to a landarea which shares the same position as the 2nd highway.

b) the 1st highway has been connected to a landarea which is very close to the position of the 2nd highway.

c) the 2 highways to be joined have nodes which are in the same position, but are not the same node, so routing is impossible

d) rather than joining highway 1 to highway 2, the end of highway 1 is very close to, but not connected to highway 2.

local CAMRA web site says this is now open

Is this really a bridleway? the road each side of the bridge is marked as tertiary

its not clear is this residential road should be connected to Padre Burgos Pototanin Junction, currently it is not

its not clear is this residential road should be connected to Padre Burgos Pototanin Junction, currently it is not

its not clear is this residential road should be connected to Padre Burgos Pototanin Junction, currently it is not

source should have been marked as survey