Correct answer
Yes, they can increase the risk of serious crashes.
Yes. They can impair attention, perception and response and increase the risk of a serious crash, even without alcohol. No specific accident share is assigned here, and presence is not equated with proven causation. The Traffic Act prohibits driving with drugs present, excluding medically prescribed substances used therapeutically when the driver remains fit to drive diligently and cautiously.
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No, they are associated only with minor crashes.
They present a risk only when mixed with alcohol.
Yes, they can increase the risk of serious crashes.
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