How can you best determine if it is safe to change lanes?

To determine if it is safe to change lanes, checking your mirrors and blind spots is the most effective method. This practice allows you to be fully aware of your surroundings, including the presence of other vehicles that may not be visible in your mirrors alone.

Mirrors provide a view of the traffic behind and to the sides of your vehicle; however, they cannot reveal everything, particularly vehicles that are in your blind spots. By physically turning your head and looking over your shoulder, you can ensure that no vehicles or obstacles are present in the area where you intend to move. This comprehensive approach significantly reduces the risk of collisions and enhances overall safety while driving.

The alternative options suggest methods that do not provide a complete assessment of the road conditions. Relying on assumptions about traffic speed or only watching the vehicles ahead does not give a full picture of the situation, and solely using the rearview mirror neglects the critical blind spots. Therefore, taking the time to check both mirrors and blind spots is vital for making informed and safe lane changes.