You are following a long vehicle. It approaches a crossroads and signals left, but moves out to the right. You should

Explanation: A lorry may swing out to the right as it approaches a left turn. This is to allow the rear wheels to clear the kerb as it turns. Don't try to filter through if you see a gap on the nearside.

Category: Other Types of Vehicle

References: The Official DVSA Guide to Driving: Section 8, Highway Code: Rule 221