You want to overtake the tractor. What should you do?

Explanation: You need to be patient when you're waiting to pass a slow-moving vehicle like a tractor.
Sometimes the driver will pull over to the left to allow you to pass more easily, but they may not always be able to do this.
To pass safely, you need a good view of the road ahead. So, stay far enough behind the tractor to allow this view. When you can see that the road ahead is clear, you should check your mirrors and only overtake if it's safe to do so.
Never overtake when you're approaching a bend, the brow of a hill or where there's a dip in the road.

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References: The Official DVSA Guide to Driving: Section 7, Highway Code: Rule 164