Yellow line (road marking) - Wikipedia

What is the purpose of adding a black line in between the white lane line on the interstate system? Why isn't it used in all 50 states? - Quora

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Rumble strip - Wikipedia

File:Broken yellow line road marking on N25 - geograph.org.uk - 1275481.jpg - Wikimedia Commons

Victorian trial to distinguish lane markings in road-work zones

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Botts' dots - Wikipedia

Cars/driving/roads/traffic: Why do some countries have a yellow stripe in the road to separate the traffic, while others have only white stripes all over? - Quora

File:Road markings lengths distances colour.png - Wikipedia

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