Since 1970, the number of motor vehicle deaths and both deaths per mile of vehicle use and per number of people in the U.S. have gone down. It is much safer on America’s highways today than it was before 1975. How has this happened? We have safer vehicles. Eighty-five percent of Americans use seat belts. Enforcement of drunken driving laws is tougher. All drivers must have and renew periodically a license and pass a driving test. Speed limits are enforced. Cars must display a license. Drivers must be insured. Cars must be registered with government jurisdictions. Car taxes are paid to governments. Only certain vehicles can be driven on public byways (e.g. no golf carts on highways, no Formula 1 racers on public roads). Iowa state highways in the 1950s had curbs, which caromed vehicles into head-on collisions; these were removed to protect us.