When is a driver allowed to change lanes?

The statement that a driver is allowed to change lanes "whenever they feel it is safe to do so" aligns with traffic laws requiring drivers to ensure it is safe before making any lane changes. This involves checking mirrors, blind spots, and ensuring that other vehicles are not too close or already occupying the lane to be changed into. Safety is the paramount concern here, as making an unsafe lane change can lead to accidents, regardless of the presence of other vehicles or speed limits.

In contrast, the other choices do not accurately reflect safe or lawful practices regarding lane changes. For instance, changing lanes only when no other vehicles are present is impractical and unrealistic on busy roads, where lane changes are frequently necessary even with the presence of other vehicles—provided it is done safely. Likewise, stating that lane changes can occur at any traffic signal ignores the context of intersections and specific traffic control measures such as stop lights or signs, which can influence lane-changing decisions. Lastly, changing lanes only when driving 10 mph below the limit sets an arbitrary speed restriction that does not relate to safety; a driver can safely change lanes at various speeds, provided proper precautions are taken. Thus, the focus should always be on ensuring it is safe when changing lanes, which is why