S.I. 1975/1536
5187
SCHEDULE 1 PART I—Warning signs (contd.
 Right hand lane of a three lane carrigeway closed to traffic ahead Permitted Variants: The symbols may be varied to indicate which lane is or lanes are closed to traffic provided that the centre lane is not shown as closed and the other lanes are shown as open unless the right hand arrow is reversed to indicate two way traffic (See Direction 17) 564.3
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 Right hand lane of a four lane carriageway closed to traffic ahead Permitted Variants: The symbols may be varied to indicate which lane is or lanes are closed to traffic, provided that if either one of the two centre lanes is shown as closed then the outside lane adjacent to it shall also be shown as closed and if both centre lanes are so shown then either one of the two outside lanes shall also be shown unless one of the arrows representing a lane not so shown is reversed to indicate two-was traffic. (See Direction 17) 564.4
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.svg) Diversion to the other carrigeway of a dual carrigeway ahead Permitted Variant: The symbol may be reversed 564.5
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 Loose chipping (See Direction 17) 565.1
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