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Question:

A double solid yellow line in the center of the road means that

A passing is not allowed on either side.
Explaination

A double solid yellow line marks the center of a road and separates lanes of traffic traveling in opposite directions. Passing is not allowed on either side of the line. You may cross the line only to make a left turn. In Pennsylvania, there is one exception to this usual traffic rule: To leave four feet of clearance when passing a bicycle, you are even allowed to cross a double yellow line into the opposing lane momentarily if you can do it safely.