The HPMS is an integrated database covering all public mileage within the state. The June submittal covers data for the previous calendar year. Thus, the June 1996 submittal was data as of December 31, 1995. This submittal includes Oregon's certified mileage for the year. This is ODOT's official tally of public mileage and a special letter indicating mileage on Indian Reservations.
All mileage is included in some record in the database.
ODOT queries all jurisdictions each year to obtain the latest breakdowns of their mileage. The sum is referred to as our universe. Because it is impracticable to collect all data items on all the universe, the HPMS contains samples. We pick the samples for various functional classes of the universe to give a representation of those classes. Universe records require a limited amount of data.