Road Rules 2014
Current version for 29 November 2019 to date (accessed 7 June 2020 at 16:34)
Part 20 Division 1 Rule 316–1
316–1   NSW rule: minimum sizes for do not overtake turning vehicle signs and give way to buses signs
(1)  Without limiting rule 316, a do not overtake turning vehicle sign or a give way to buses sign does not comply substantially with these Rules unless the sign also complies with the size requirements for the sign set out in this rule.
(2)  A do not overtake turning vehicle sign must comply with following requirements—
(a)  the sign must have a minimum area of 0.125 square metres,
(b)  the words “DO NOT OVERTAKE TURNING VEHICLE” must appear on the sign in block letters with a height of not less than 50 millimetres.
(3)  A give way to buses sign must have a minimum area of 0.125 square metres.
Note.
 This rule is an additional NSW road rule. There is no corresponding rule in the Australian Road Rules.