Lorry and truck definitions clarify motor vehicle classification for goods transport and related equipment categorisation. Standard reference works define lorry and truck as motor vehicles designed to carry freight or perform special services, treating the terms as largely synonymous and emphasizing their functional role in goods transport. Technical encyclopaedias describe the truck crane as a crane house and boom mounted on a truck chassis, noting mobility on firm roads, limited performance on soft ground, use of telescoping booms and hydraulic extension, and a tradeoff between transportability and hoisting capacity.