What is the first step you should take before passing another vehicle?

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Before passing another vehicle, it's crucial to check your mirrors. This action is essential because it allows you to be aware of your surroundings, particularly any vehicles or obstacles that may be in your blind spots. By checking both your rear and side mirrors, you ensure that the lane is clear and that it is safe to initiate the passing maneuver.

Once you have confirmed that it's safe to pass, you would typically signal your intention to inform other drivers of your actions, adjust your speed appropriately, and then steer smoothly into the passing lane. However, the initial step of checking mirrors is critical as it prevents accidents and helps maintain safety on the road.