S.I 1981/859
2501
SCHEDULE 1 Part I—Warning signs (contd.)
 Headroom at hazard Permitted Variant: Metric units may be substituted for imperial units within the warning triangle (See Direction 11) 530
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 Limits within which headroom indicated is available at hazard Permitted Variant: Same as for 530 (See Direction 11) 532.1
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 Electrified overhead cable ahead See direction 11 533
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.svg) Plate for use with sign in diagram 533 See direction 12 534.1
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