When is it permissible to change lanes?

Changing lanes is primarily permitted when it is safe to do so and after you have signaled your intent. This approach ensures that you communicate your maneuver to other drivers, allowing them to anticipate your actions and adjust accordingly. Signaling is a critical part of lane changes, as it promotes safety and helps prevent accidents.

Additionally, checking for safety involves assessing the traffic around you, which includes ensuring that there are no vehicles in your blind spots and that other drivers have enough space to react. It is not sufficient to rely solely on personal necessity or the condition of the lanes being clear, as safety considerations and communication with other road users are essential for any lane change maneuver. Therefore, following the proper signaling protocol not only aligns with traffic laws but also reinforces defensive driving practices.