In 2012, the IDB approved a project to support the preparation of a comprehensive public transport system for the metropolitan area of ​​La Paz and El Alto. The project included technical, legal, economic, social and environmental studies. One component was an urban mobility survey, which constitutes the main source of data for the present analysis. Within this framework, we gathered information on the travel patterns and socioeconomic characteristics of residents in June and July 2015. To obtain comparable data and to determine the most common trips, such as from home to work or school and back, we collected data from 6 p.m. to 9 p.m. on weekdays and weekends. The sample was collected at the sub-district level (blocks) to cover the districts of La Paz and El Alto, following a random selection process (see Annex 2 for more details). A total of 6,720 inhabitants of La Paz (4,208) and El Alto (2,512) were interviewed from a total of 6,208 households (3,892 and 2,316 in La Paz and El Alto respectively). Participants were surveyed about the last two trips they had made prior to the interview date.