Which of the following is NOT a safe practice when changing lanes?

When changing lanes, safety is paramount, and appropriate practices must be followed to ensure the well-being of all road users. Cutting off the vehicle in the next lane is not a safe practice because it can create a hazardous situation. This action can lead to collisions, as the driver being cut off may not have the time or space to react safely. Safe lane-changing requires considering the actions of other road users and allowing them enough space to maintain their own speed and position on the road.

In contrast, checking mirrors and blind spots is essential for being aware of surrounding traffic, while using turn signals is critical for communicating your intentions to other drivers. Likewise, adjusting your speed to match traffic flow helps to ensure a smooth and safe transition between lanes. All of these practices contribute to a safer driving environment and decrease the likelihood of accidents.