When changing lanes on a freeway, you should:

Signal at least five seconds prior to a changing lanes on a freeway. Always signal when turning left or right, changing lanes, slowing down, or stopping to let other drivers, motorcyclists, bicyclists, and pedestrians know your intentions.

• Signal for at least five seconds.
• Slow down before you start to change lanes.
• Assume there is enough space in the next lane for your vehicle, if you signal first.