Comments by "Keith Bradbury" (@keithbk) on "Road Rage USA u0026 Canada | Bad Drivers, Hit and Run, Brake check, Instant Karma, Car Crash | New 2022" video.

It appears they changed lanes without signalling, and they did it slow enough that it looks like they were not maintaining their lane. That's usually my problem with people "drifting" into other lanes; they could be asleep at the wheel or texting and driving, or intoxicated. I could be wrong, but that was my first thought on this one; I rewatched and swear I didn't see a signal.
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