Overview of motorcycling in the United States: a national telephone survey.

Objectives: Motorcycle registrations have risen in recent years. Although motorcyclist crash fatalities in 2009 were 16% lower than in 2008, they were double the number of deaths in 1997. The present study examined current motorcyclists' travel patterns and views of motorcycle helmets and other safety topics.

Long-term effects of handheld cell phone laws on driver handheld cell phone use.

Objectives: As of October 2009, seven U.S. states and the District of Columbia (D.