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This is what the MV Act says about signaling.
Signals on turning
170 (1) If traffic may be affected by turning a vehicle, a person must not turn it without giving the appropriate signal under sections 171 and 172.
(2) If a signal of intention to turn right or left is required, a driver must give it continuously for sufficient distance before making the turn to warn traffic.
(3) If there is an opportunity to give a signal, a driver must not stop or suddenly decrease the speed of a vehicle without first giving the appropriate signal under sections 171 and 172.
Means of signalling
171 (1) Subject to subsection (2), if a signal is required a driver must give it by means of
(a) his or her hand and arm,
(b) a signal lamp of a type approved by the director, or
(c) a mechanical device of a type approved by the director.
(2) When a vehicle is constructed or loaded in a manner that makes a signal by hand and arm not visible both to its front and rear, or a body or load extends more than 60 cm to the left of the centre of the steering wheel, a driver must give signals as provided by paragraph (1) (a) or (b), and a person must not drive the motor vehicle on a highway unless it is so equipped.
There is no time/distance given for the signaling that is done..
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