Based on some statistics, cars and bikes each carry a certain risk of death. According to those numbers, a motorist is exposed to a risk of death equal to about .47 per million driving hours. That means about 47 deaths per hundred million driving hours. A cyclist's risk is about .27 per million cycling hours, or 27 deaths per hundred million cycling hours.
Since a commuting cyclist takes roughly twice as long to cover the same distance as a motorist, the risk of death for both is about the same. This risk represents all cyclists, from child to club cyclist.
There is one factor that changes the whole picture, tipping the scales greatly in favor of bicycle commuting as significantly safer than driving a car: training in effective cycling.
Of course, who would believe that cycling is safer than motoring?
Most people still feel safer driving than flying a commercial airline, even though the risk of death per million flying hours is far less than either cycling or driving.