What must you do before changing lanes in a commercial vehicle?

Before changing lanes in a commercial vehicle, it is essential to check mirrors and blind spots, and signal your intention. This practice is crucial for ensuring safety on the road, especially given the size and characteristics of commercial vehicles which can have significant blind spots. Checking mirrors allows the driver to see what is currently happening in adjacent lanes, while checking blind spots ensures that there are no vehicles or obstacles that might not be visible through the mirrors. Signaling your intention communicates to other drivers what you plan to do, which helps in preventing accidents.

Proper lane-change procedures are particularly important for commercial drivers due to the larger size of their vehicles and the potential for serious consequences in the event of a collision. By adhering to this practice, drivers can make informed decisions about when it is safe to change lanes, thereby increasing the safety of themselves and others on the road.