The majority of people killed in traffic crashes in 2008 were

Vehicle occupants

Explanation:

According to the National Highway Traffic Safety Administration, vehicle occupants accounted for 72% of traffic fatalities in 2008, while motorcyclists accounted for 14% and another 14% involved pedestrians, pedalcyclists and other nonoccupants. Although traffic fatalities have decreased in recent years, there is much left to be done in order to ensure that driving becomes as safe as possible for most people.

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