In California changing lanes in the middle of an insertion is what?

In California, changing lanes in the middle of an insertion is considered unsafe lane changing or weaving and is illegal. According to the California Department of Motor Vehicles (DMV), "Unsafe lane changing means moving your vehicle from one lane to another when conditions, such as heavy traffic or fog, make changing lanes dangerous." When inserting into traffic from an on-ramp or merging lane, drivers must wait until they can safely and completely merge into the desired lane without impeding the flow of traffic or posing a risk to other vehicles. Failure to adhere to these regulations can result in traffic violations and potential penalties.