PECS Card Overview & Ratings
A semi-trailer truck, also known as a semi, tractor-trailer, truck and trailer, transfer truck, 18-wheeler, mack truck, big rig (US), transport (Canada), artic (UK and Ireland), or lorry (UK), is an articulated vehicle consisting of a towing engine (tractor in the United States, prime mover in Australia or truck in Ireland, the United Kingdom, Canada and New Zealand), and a semi-trailer (plus possible additional trailers) that carries the freight.