1,606,On the central island of a roundabout or in combination with a plate of the type shown in diagram 608.,
2,609,On a road approaching its junction with a dual-carriageway road or in combination with a plate of the type shown in diagram 608.,
3,616, 1046 or 1047,At a site which has been approved in writing by or on behalf of the Secretary of State.,
4,629.2,On –  a   the approach to a bridge, tunnel or similar structure which limits the height of vehicles using the road under the bridge, through the tunnel or under or through the similar structure; or     b   any such bridge, tunnel or similar structure.   ,
5,712.1, 719.3A or 729.2,When including a symbol represented in –  a   any diagram in Part I of Schedule 1 to the Regulations; or     b   diagram 629.2 in Part II of that Schedule in the circumstances specified in item 4 above.   ,
6,818.2,When placed to indicate that the prohibition indicated by the sign shown in diagram 629.2 is ahead, provided that that sign has been placed in the circumstances specified in item 4 above.,