National Household Travel Survey
The NHTS/NPTS serves as the nation's inventory of daily travel. Data is collected on daily trips taken in a 24-hour period, and includes: purpose of the trip (work, shopping, etc.); means of transportation used (car, bus, subway, walk, etc.); how long the trip took, i.e., travel time; time of day when the trip took place; day of week when the trip took place; and if a private vehicle trip: number of people in the vehicle , i.e., vehicle occupancy;
driver characteristics (age, sex, worker status, education level, etc.); and vehicle attributes (make, model, model year, amount of miles driven in a year).