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Several reasons.

Lowest cost colors. Longest lasting colors. Very visible under most conditions. Other colors would more likeyl confuse or not been seen by people who are color blind. While they may not see the difference between white and yellow, at least they don't blend into the road surface as red, blue or green definitely would.

White and yellow paints are universal throughout the entire United States highway system. Yellow is always used to signify caution,(ie) broken yellow means passing zone using caution, white is used to designate the farthest to the right you may safely drive, it's also known as the"fog" line.

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2011-09-13 14:04:11
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Q: Why do they use only white and yellow paint on roadways?
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