For a car travelling at 70 km/h the risk increased fourfold. Thus, a car travelling at 65 km/h was twice as likely to be involved in a casualty crash as one travelling at 60 km/h. They found that the risk approximately doubled for every 5 km/h above 60 km/h.
Using data from actual road crashes, scientists at the University of Adelaide estimated the relative risk of a car becoming involved in a casualty crash-a car crash in which people are killed or hospitalised-for cars travelling at or above 60 km/h. So we happily let the speedo hover just above the speed limit, unaware that by so doing we are greatly magnifying our chances of crashing. We figure that while the speed limit is 60 km/h the police won't pull us over if we sit on 65. It may not seem like much, but driving even a few kilometres per hour above the speed limit greatly increases the risk of an accident.
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