A-road (GB)
Principal highway
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A-train
Tractor with one semi-trailer and one full trailer
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Airlock
An air bubble in fuel system etc.
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Artic (GB)
Tractor semi-trailer / semi (AUS, USA) (from articulated lorry)
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Articulated lorry (GB-except north of England)
Tractor semi-trailer
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Articulated vehicle
Any vehicle towing a trailer, usually refers to a semi-trailer
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