According to the California driver handbook,
Quote:
Before changing lanes, signal, look in all your mirrors, and:- Check traffic behind and beside you.
- Glance over your left or right shoulder to make sure the lane you want is clear.
- Look for vehicles or motorcyclists in your blind spot.
- Be sure there is enough room for your vehicle in the next lane.
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No mention of signals. But if you consider changing lanes a turn, here's the law:
Quote:
CVC 21703
Proper Use of a Turn Signal
22108. Any signal of intention to turn right or left shall be given continuously during the last 100 feet traveled by the vehicle before turning.
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Which would be both a request and an alert, making this bumper sticker unnecessary:
