What is the first step to take before changing lanes?

Checking your mirrors and blind spots is a crucial first step before changing lanes because it helps ensure that the space is clear and safe for maneuvering. By checking your mirrors, you are able to see vehicles that are approaching from behind or beside you. Blind spots are areas that are not visible through your mirrors, so looking over your shoulder ensures that no vehicles or obstacles are hidden there.

This step is important for maintaining safety on the road, as it allows you to assess the surrounding traffic conditions effectively. Only after confirming that it is safe to proceed should you follow up with signaling your intention to change lanes and then execute the maneuver. Ensuring that you're aware of all vehicles around you significantly reduces the risk of accidents during lane changes.