Plate for use with signs in diagrams 504.1 to 507.1, 510, 512, 513, 516, 517, and 520
Permitted Variant: When used in conjunction with any of the signs in diagrams 504.1 to 507.1 may be varied to read "Heavy plant crossing" (See Direction 12)
511
Bend to the right ahead
Permitted Variant: The symbol may be reversed to indicate a bend to the left ahead
512
Double bend ahead,first to the left
Permitted Variant: The symbol may be reversed to indicate a double bend ahead, first to the right