As part of being a safe and responsible driver, not only do you need to know and follow the rules of the road; you also need to use common sense, and be thoughtful and courteous to other drivers, pedestrians, and bicyclists.
This means that you share the road responsibly, give the right of way, and do not take actions that can cause trouble or risk for others.
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For example, if you tailgate, drive recklessly, pass the stop sign without fully stopping, ignore giving the right of way, or drive too slowly in the fast lane forcing other drivers to pass you on the right, you are not courteous to other drivers on the road.