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May be used with diagram 782, 783, 784. 7, 787, 788 or 7 028.3. "AT CROSSING" may be omitted. "AND USE PHONE" may be varied to "AND USE SOS PHONE" or "& USE SOS PHONE" The latter should be used only when plating an existing sign (see working drawing P 786)
21.15 Diagram 786 indicates the positions at which a vehicle should wait while the driver telephones before or after crossing the line. A marking to diagram 1028.3 (with no accompanying legend) may be used with the sign (direction 25(1)).
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787 Site of telephone
(Alternative types)
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788 Direction to telephone (Alternative Types)
The direction of the arrow may be reversed
21.16 Diagrams 787 and 788 are used to indicate the location of the telephone. Diagram 788 is used only where this is not readily apparent.
COUNTDOWN MARKERS
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The symbols are reversed when the signs are mounted on the off side
21.17 Countdown markers to diagrams 789, 789.1 and 789.2 may be used to emphasise the approach to a crossing. They are intended to divide into equal lengths the distance between the first marker, with three bars, and the crossing. The first marker should be co-located with the warning sign to diagram 770, 771 or 772 (see para 21.2). Unlike the countdown markers on the approach to a junction, the bars do not represent intervals of 100 yards, as the warning sign will usually be less than 300 yards from the crossing. If the signs are duplicated on the off side of the road, for greater emphasis or to improve visibility, the slope of the bars is reversed.
21.18 Where queues sometimes extend upstream of the crossing warning signs, especially if the end of the queue might be hidden by a bend, queue warning signs might be necessary (see para 20.5).
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