Even though the BMW was clearly poised to mnake a left turn and had its left turn signal activated, there was no reason for (him) to expect that the BMW would turn in front of him. (bc-injury-law.com)
If the system detects the car is crossing out of its lane without the the turn signal activated then you'll be alerted with a beep or buzz. (cnet.com)
If the vehicle begins to move out of a detected lane without the turn signal activated, LDW illuminates a Lane Departure message on the Multi-Information Display (MID) and sounds an audible warning, advising the driver to take appropriate action. (hondanews.com)