A knock down signpost, including: a lower body member having an annular bearing surface bounding a spigot portion; an upper post supporting member having a lower annular surface corresponding to said annular bearing surface and bounding a recess adapted to receive said spigot portion, said spigot portion and recess being mutually configured to allow an articulation of said upper post supporting member about an engagement of said lower annular surface and annular bearing surface in any direction, the spigot portion and recess including means to constrain initial impact movement of the upper post supporting member to minimize lateral displacement; characterised in that the knock down signpost further comprises: a pair of spaced, flexible cables passing through said lower body member and said upper post supporting member, one end of each said cable being retained in one of said lower body member and said upper post supporting member and said cables being pretensioned by tension means located in the other of said lower body member and said upper post supporting member to urge said lower body member and upper post supporting member into mutual engagement against said articulation and providing primary circumferential alignment between said lower body member and said upper post supporting member; and complementary indexing means (14, 16) associated with said spigot portion and recess to complete circumferential alignment between said lower body member and said upper post supporting member on elastic recovery thereof. a lower body member having an annular bearing surface bounding a spigot portion; an upper post supporting member having a lower annular surface corresponding to said annular bearing surface and bounding a recess adapted to receive said spigot portion, said spigot portion and recess being mutually configured to allow an articulation of said upper post supporting member about an engagement of said lower annular surface and annular bearing surface in any direction, the spigot portion and recess including means to constrain initial impact movement of the upper post supporting member to minimize lateral displacement; characterised in that the knock down signpost further comprises: a pair of spaced, flexible cables passing through said lower body member and said upper post supporting member, one end of each said cable being retained in one of said lower body member and said upper post supporting member and said cables being pretensioned by tension means located in the other of said lower body member and said upper post supporting member to urge said lower body member and upper post supporting member into mutual engagement against said articulation and providing primary circumferential alignment between said lower body member and said upper post supporting member; and complementary indexing means (14, 16) associated with said spigot portion and recess to complete circumferential alignment between said lower body member and said upper post supporting member on elastic recovery thereof. a pair of spaced, flexible cables passing through said lower body member and said upper post supporting member, one end of each said cable being retained in one of said lower body member and said upper post supporting member and said cables being pretensioned by tension means located in the other of said lower body member and said upper post supporting member to urge said lower body member and upper post supporting member into mutual engagement against said articulation and providing primary circumferential alignment between said lower body member and said upper post supporting member; and complementary indexing means (14, 16) associated with said spigot portion and recess to complete circumferential alignment between said lower body member and said upper post supporting member on elastic recovery thereof.