Respondents are requested to start the positioning application
to automate GPS recording before commencing the first trip of the day, and to keep it open until the final arrival home each day during the survey period.The respondents are requested to close
the application at home to decrease battery consumption and alleviate privacy issues for the respondents, especially those who are reluctant to be tracked at home. The positioning data needs to be uploaded to a database on our server, which can be performed with a single touch. It is recommended that respondents upload data within a Wi-Fi environment in order to reduce data transmission costs. Afterwards, interviewers contact respondents by telephones to ask them to check the primary travel information that is automatically detected from the data streams uploaded by respondents.