NOTES: An eligible driver is someone 16 years of age and older who is eligible for a driver's license.The cities shown represent the 50 largest metropolitan areas, as well as others chosen by the states sponsoring the Texas Transportation Institute study on mobility. Due to changes in methodology, data for all years shown were revised. For a detailed explanation of the formulas used, see the source document.
SOURCE: 1982-97: Texas Transportation Institute, The 1999 Annual Urban Mobility Report (College Station, TX: 1999), table 4.