On a road with two lanes traveling in opposite directions, slow-moving vehicles should pull over when safe to let others pass when:

5 or more vehicles are behind you.

Explanation:

According to my research on traffic safety rules and regulations, I can say that based on the information provided within the question slow-moving vehicles should pull over when safe to let others pass when 5 or more vehicles are behind you. This is a safety rule because if cars start pilling up behind a slow moving vehicle they will begin to switch to the oncoming traffic lane in order to pass which can lead to an accident.

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