Ais used to separate lanes of traffic moving in opposite directions where changing lanes is permitted.

A "Yellow lane line" is used to separate lanes of traffic moving in opposite directions where changing lanes is permitted.

Explanation:

In many territories including The United States of America, the yellow lane lines are employed to separate the lanes of traffic that have different course directions. But only in traffic streams were changing lanes are allowed. So they are not employed in traffic streams or roads that are not designed for that. They very often divide the single road in to or more streams and they have small white lines inside that signal the internal division in them.

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answer; deviation iq; //(a)