Question Topic: Band 1 road procedure
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Explanation: A long vehicle may have to straddle lanes on, or approaching, a roundabout. This is to prevent the rear wheels from going up onto the kerb. If you're following a long vehicle, stay well back and give it plenty of room.
Category: Band 1 road procedure
References: The Official DVSA Guide to Driving: Section 8, Highway Code: Rule 78, Highway Code: Rule 187, Highway Code: Rule 188