Every day, almost 90% of journeys and 92% of miles traveled are made in cars or ground transportation (buses, trucks). For almost 180 millions of us, driving is the primary means of transportation, for journeys to and from work, to the store, and for pleasure. On average, men drive 44 miles and women drive 34 miles each day. We Americans love our cars. For some Americans, driving a motorized road vehicle is also their job: truck drivers, bus drivers, ambulance and fire trucks, police, taxis etc