_id date_observed   day_observed   hour_observed   origin   destination   distance   origin_activity   destination_activity   origin_study   destination_study   permanent_location   income   age_range   sex   trips_number   trips_km   autonomous_community   trip   distance_order   colspacer
date_observed day_observed hour_observed origin destination distance origin_activity destination_activity origin_study destination_study permanent_location income age_range sex trips_number trips_km autonomous_community trip distance_order