Final answer:
To change lanes in traffic, you should always use your turn signal to indicate your intention to other drivers.
Step-by-step explanation:
Before changing lanes in traffic, you should always signal to indicate your intention to other drivers. The standard signal to use is the turn signal, which is typically located on the steering column of your vehicle. To use the turn signal, simply push the lever up or down in the direction you want to turn. This will activate a blinking light on the corresponding side of your vehicle, alerting other drivers to your intended lane change.