Why has the tractor got flashing amber lights?

Explanation: Many vehicles have coloured flashing lights that tell you the vehicle's function or how it will behave.
Slow-moving vehicles use flashing amber beacons to warn other road users of their slow speed; for example, tractors, roadwork vehicles and bin lorries.
You should be patient when trying to overtake slow-moving vehicles.

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References: The Official DVSA Guide to Driving: Section 7, Highway Code: Rule 225