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Re:A Waymo One Rider’s Experiences Highlight Autonomous Ride... by javagram on Sunday January 27, 2019 @12:27PM (#19012663)
Before turning is the law. e.g. Maryland Code "(d) Where signals to be given.- When required, a signal of intention to turn right or left shall be given continuously during at least the last 100 feet traveled by the vehicle before turning; except that a bicyclist may interrupt the turning signal to maintain control of the bicycle."

There are actually many states where using the turn signals to change lanes isn't even legally required though, so things are more mixed when it comes to changing lanes vs. making turns.

Re:A Waymo One Rider’s Experiences Highlight Autonomous Ride... by UncleEntity on Sunday January 27, 2019 @02:18PM (#19013263)
> There are actually many states where using the turn signals to change lanes isn't even legally required though, so things are more mixed when it comes to changing lanes vs. making turns.

Arizona is one state where it is required judging by a warning I got from a friendly highway patrol officer who chased me ~5 miles while I was having fun on the old ninja during morning rush hour.