When changing from the right to the left lane on the interstate, what is the proper procedure?

The correct procedure for changing from the right to the left lane on the interstate involves signaling left, checking both mirrors, and looking over the left shoulder. This approach ensures that the driver is fully aware of their surroundings and any vehicles in the left lane that may not be visible through mirrors alone.

When signaling left, the driver alerts others to their intention to change lanes, which is crucial for maintaining safety. Checking both mirrors is essential to gauge the speed and proximity of vehicles behind, in the right lane, and in the left lane. Looking over the left shoulder provides a final confirmation of any blind spot that might not be covered by mirrors, ensuring that the lane is clear before executing the lane change.

In this situation, simply signaling right and checking mirrors, or focusing only on mirror checks, can leave a driver unaware of vehicles in the blind spot, which could lead to accidents. Similarly, reducing speed before signaling left might create confusion for the drivers behind, as it could be interpreted as an unexpected maneuver rather than a planned lane change. Therefore, the comprehensive approach of signaling left, checking both mirrors, and looking over the left shoulder ensures a safer lane change procedure.