Hmmm, maybe all of us BMW drivers knew this all along:
Failing to Signal Contrary to Section 142 of the Highway Traffic Act. In addition to causing significant annoyance, failing to signal poses a danger to others who may be surprised by an unexpected move. Equally annoying may be the driver that uses a signal; yet, the signal is applied only at...
defendit.ca
"As shown within
section 142 of the
Highway Traffic Act, the legal requirement is to use a signal to provide advance warning to other drivers of a forthcoming turn or lane change rather than as an advisement of an immediate action. Interestingly, whereas the legal requirement is that a signal must indicate intention to turn or change lanes where doing so may affect the safe "
operation of any other vehicle", the failure to signal charge requires proof that there actually was another vehicle in the area that was potentially affected; and accordingly, where another vehicle is absent, the legal requirement to signal is absent. "