Why should you check your right-hand mirror just before turning right from a main road into a side road?

Explanation: Driving a large vehicle will sometimes require you to position your vehicle well to the left before making a tight right turn. Inexperienced drivers or riders may not realise your intentions and may try to overtake you. Make sure you signal in good time and make a final mirror check before committing yourself to the turn.

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References: The Official DVSA Guide to Driving Buses and Coaches: Section 4, The Official DVSA Guide to Driving Goods Vehicles: Section 4