Definition
This variable indicates how many people (including the respondent) usually rode to work in the vehicle that the respondent took to work during the previous week. This excludes persons who drove or rode in the same vehicle to school, or who returned home after dropping off workers, or who rode to any other non-work location. A worker who rode to work with one or more other people, but who was the only worker in the vehicle, was counted as driving alone.
Universe
Persons age 16+ who worked last week and used a private auto, truck, or van as their primary means of transportation to work