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HORoad lines communicate rules about movement, passing, and safety. Solid white lines separate lanes moving in the same direction and usually mean you shouldn’t change lanes abruptly. Dashed white lines indicate that lane changes are allowed when safe. Solid yellow lines separate traffic moving in opposite directions, and if the yellow line is solid on your side, passing is not permitted.
Double solid yellow lines mean no passing in either direction because visibility or road conditions make it unsafe. A broken yellow line next to a solid yellow line means the side with the broken line can pass when clear. Road markings are designed to control traffic flow, reduce collisions, and create predictable driving behavior so everyone understands who can move where and when.
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