In california 2013, the #1 primary factor that led to fatal or otherwise harmful traffic collisons was which of the following?

Recklessness or negligent behaviors by motorists contributed significantly to a large number of accidents witnessed in California in 2013. Speeding has been a prevalent cause of severe car accidents, in 2013 it is estimated that 10,000 people were killed nationally in these accidents. In the State of California, one out of three drivers who died in car crashes were under the influence of drugs.

In 2013 over 150,000 crashes were reported in California where 2,800 were fatal according to the California Highway Patrol.

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According to official records, the leading causes of accident in California were distracted driving, overspending and impaired driving as a result of drug use and other substance abuse.