Re: Unsafe Lane Change in California
No, 21658(a) is the correct violation for what was described. It governs movement between two or more lanes traveling the same direction.
22107 is for unsafe turns which 21658 dosen't cover. Say, someone reaches down for their cell phone, tugs the wheel and crashes into the center divide, 22107. Guy says, "Oh man, I need to get off here", pulls the wheel right, crosses from the right lane, through the gore point, then into the offramp lane, causing the person allready on the offramp to brake (or perform any other evasive manuver). Since the gore point is not a lane of travel, 22107 applies.
One of my bigger pet peeves is when people see my patrol car and lose their mind, either at a stop sign, right turn on red, or whatever. Their action sometimes creates chaos. I've witnessed accidents caused SIMPLY because someone saw me, got nervous, and did something silly. You are not going to get a ticket if you wait unitl there is plenty of space, signal, and move into the lane when it is safe to.
I'm a cop. My opinion does not reflect the views or opinion of my agency. That being said, "Do not argue with an idiot. He will drag you down to his level and beat you with experience."