“Signs, markings and signals to be of the size, colour and type shown in the diagrams 11(1) Subject to the provisions of these Regulations, a sign for conveying information or a warning, requirement, restriction, prohibition or speed limit of the description specified under a diagram in Schedules 1 to 7, Part II of Schedule 10 and Schedule 12 to traffic on roads shall be of the size colour and type shown in the diagram.”
“Signs to be placed only to indicate the effect of a statutory prohibition 7(1) … the signs to which this paragraph applies may be placed on or near a road only to indicate the effect of an Act, order, regulation, byelaw or notice (“the effect of a statutory provision”) which prohibits or restricts the use of the road by traffic.”
“(3) There is a requirement that at the geographical point where the motorist exceeded the limit, the requisite signs could reasonably be expected to have conveyed the limit to an approaching motorist in sufficient time for the motorist to reduce from a previous lawful speed to a speed within the new limit. (4) No.”