NEW CROSSINGS
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21.19 Diagram 790 is used following alteration of the method of control of a level crossing. In the case of a new installation, "CONTROL" should be omitted. The sign must be removed within three months of the date of completion of the works (direction 37(1)).
SIZES OF LEVEL CROSSING SIGNS
21.20 Guidance on the appropriate sizes for triangular warning signs and supplementary plates can be found in Appendices A and B respectively. Diagrams 774, 775, 777, 783 to 786 and 788 are prescribed in several sizes, the smallest being appropriate where approach speeds do not exceed 30 mph, and the largest where the national speed limit applies. For intermediate approach speeds, sizes should be proportioned accordingly, using the nearest prescribed size.
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