Question Topic: The Road
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Explanation: The red studs on your left indicate the edge of the hard shoulder, while the white studs are used between the lanes. Using more than one reference point will help you to be certain of your position.
Category: The Road
References: The Official DVSA Guide to Driving Buses and Coaches: Section 4, The Official DVSA Guide to Driving Goods Vehicles: Section 4, Highway Code: Rule 132