group of humans: any set of human beings

road transport: collective term for all forms of transport which takes place on roads, or (ground) surface, except railroads

natural rubber: polymers of the organic compound isoprene, with minor impurities of other organic compounds; refined from latex harvested from rubber trees

worker: person who works

minecart: type of rail vehicle used with mine railways

tram: public transport vehicle running on rails predominantly located on streets

railroad car: vehicle used for carrying cargo or passengers on rail transport system

vegetation: total of plant formations and plant communities

railway: interconnected network of infrastructure and vehicles used for train rail transport