Look at the painted "stripes/lane" markings on the road. If there is a SOLID white line, you are NOT supposed to change lanes at that point. If the lane markings are "dashed" you CAN change lanes. In some states it is a moving violation if you cross a solid white line. On 2 lane roads and some 3 lane roads the center line is yellow. When the line on your side is solid yellow you cannot pass, if the line on your side is dashed you can pass with caution yielding to oncoming traffic.
This also means if you are not changing lanes you need to be aware of the lane markings because the OTHER driver can change lanes. And some will change no matter what the markings are, we all know about defensive driving.
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