This minor group includes transport truck drivers; bus drivers, subway operators and other transit operators; taxi and limousine drivers and chauffeurs; and delivery and courier serice drivers. They are employed by transportation, manufacturing, distribution and moving companies and trucking employment service agencies; urban transit systems, school boards and transportation authorities and private transportation companies; taxi and other transportation service companies; businesses, governments and other organizations and private individuals and families; dairies, drug stores, newspaper distributors, take-out food establishments, dry cleaners, mobile caterers, courier and messenger service companies; and many other establishments; or they may be self-employed.