What is the proper procedure for signaling when changing lanes?

The proper procedure for signaling when changing lanes is to signal at least 100 feet before making the lane change. This timing is crucial because it provides adequate notice to other drivers about your intention, allowing them to safely adjust their speed or position if necessary. Signaling early helps to promote safety on the road by ensuring that all road users are aware of your actions ahead of time.

This practice is especially important in busy traffic situations where visibility and reaction time can be limited. By signaling well in advance, you give drivers behind and beside you the opportunity to respond appropriately, which reduces the risk of accidents.

The other options suggest signaling at the wrong times or not signaling at all, which compromises road safety and can lead to misunderstandings or collisions with other vehicles.